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diff --git a/Source/WebKit2/UIProcess/API/APINavigationClient.h b/Source/WebKit2/UIProcess/API/APINavigationClient.h
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+++ b/Source/WebKit2/UIProcess/API/APINavigationClient.h
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+/*
+ * Copyright (C) 2014, 2015 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "APIData.h"
+#include "PluginModuleInfo.h"
+#include "SameDocumentNavigationType.h"
+#include "WebEvent.h"
+#include "WebFramePolicyListenerProxy.h"
+#include "WebsitePolicies.h"
+#include <WebCore/FrameLoaderTypes.h>
+#include <WebCore/LayoutMilestones.h>
+#include <wtf/Forward.h>
+
+namespace WebCore {
+class ResourceError;
+class ResourceRequest;
+class ResourceResponse;
+struct SecurityOriginData;
+}
+
+namespace WebKit {
+class AuthenticationChallengeProxy;
+class QuickLookDocumentData;
+class WebBackForwardListItem;
+class WebFramePolicyListenerProxy;
+class WebFrameProxy;
+class WebPageProxy;
+class WebProtectionSpace;
+struct NavigationActionData;
+struct WebNavigationDataStore;
+}
+
+namespace API {
+
+class Dictionary;
+class Navigation;
+class NavigationAction;
+class NavigationResponse;
+class Object;
+
+class NavigationClient {
+public:
+    virtual ~NavigationClient() { }
+
+    virtual void didStartProvisionalNavigation(WebKit::WebPageProxy&, API::Navigation*, API::Object*) { }
+    virtual void didReceiveServerRedirectForProvisionalNavigation(WebKit::WebPageProxy&, API::Navigation*, API::Object*) { }
+    virtual void didFailProvisionalNavigationWithError(WebKit::WebPageProxy&, WebKit::WebFrameProxy&, API::Navigation*, const WebCore::ResourceError&, API::Object*) { }
+    virtual void didFailProvisionalLoadInSubframeWithError(WebKit::WebPageProxy&, WebKit::WebFrameProxy&, const WebCore::SecurityOriginData&, API::Navigation*, const WebCore::ResourceError&, API::Object*) { }
+    virtual void didCommitNavigation(WebKit::WebPageProxy&, API::Navigation*, API::Object*) { }
+    virtual void didFinishDocumentLoad(WebKit::WebPageProxy&, API::Navigation*, API::Object*) { }
+    virtual void didFinishNavigation(WebKit::WebPageProxy&, API::Navigation*, API::Object*) { }
+    virtual void didFailNavigationWithError(WebKit::WebPageProxy&, WebKit::WebFrameProxy&, API::Navigation*, const WebCore::ResourceError&, API::Object*) { }
+    virtual void didSameDocumentNavigation(WebKit::WebPageProxy&, API::Navigation*, WebKit::SameDocumentNavigationType, API::Object*) { }
+
+    virtual void renderingProgressDidChange(WebKit::WebPageProxy&, WebCore::LayoutMilestones) { }
+
+    virtual bool canAuthenticateAgainstProtectionSpace(WebKit::WebPageProxy&, WebKit::WebProtectionSpace*) { return false; }
+    virtual void didReceiveAuthenticationChallenge(WebKit::WebPageProxy&, WebKit::AuthenticationChallengeProxy*) { }
+
+    // FIXME: These function should not be part of this client.
+    virtual void processDidCrash(WebKit::WebPageProxy&) { }
+    virtual void processDidBecomeResponsive(WebKit::WebPageProxy&) { }
+    virtual void processDidBecomeUnresponsive(WebKit::WebPageProxy&) { }
+
+    virtual RefPtr<Data> webCryptoMasterKey(WebKit::WebPageProxy&) { return nullptr; }
+
+#if USE(QUICK_LOOK)
+    virtual void didStartLoadForQuickLookDocumentInMainFrame(const WTF::String& fileName, const WTF::String& uti) { }
+    virtual void didFinishLoadForQuickLookDocumentInMainFrame(const WebKit::QuickLookDocumentData&) { }
+#endif
+
+    virtual void decidePolicyForNavigationAction(WebKit::WebPageProxy&, API::NavigationAction&, Ref<WebKit::WebFramePolicyListenerProxy>&& listener, API::Object*)
+    {
+        listener->use({ });
+    }
+
+    virtual void decidePolicyForNavigationResponse(WebKit::WebPageProxy&, API::NavigationResponse&, Ref<WebKit::WebFramePolicyListenerProxy>&& listener, API::Object*)
+    {
+        listener->use({ });
+    }
+    
+#if ENABLE(NETSCAPE_PLUGIN_API)
+    virtual WebKit::PluginModuleLoadPolicy decidePolicyForPluginLoad(WebKit::WebPageProxy&, WebKit::PluginModuleLoadPolicy currentPluginLoadPolicy, API::Dictionary*, WTF::String&)
+    {
+        return currentPluginLoadPolicy;
+    }
+#endif
+
+    virtual void didBeginNavigationGesture(WebKit::WebPageProxy&) { }
+    virtual void willEndNavigationGesture(WebKit::WebPageProxy&, bool willNavigate, WebKit::WebBackForwardListItem&) { }
+    virtual void didEndNavigationGesture(WebKit::WebPageProxy&, bool willNavigate, WebKit::WebBackForwardListItem&) { }
+    virtual void didRemoveNavigationGestureSnapshot(WebKit::WebPageProxy&) { }
+};
+
+} // namespace API