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diff --git a/chromium/chrome/common/extensions/chrome_manifest_url_handlers.h b/chromium/chrome/common/extensions/chrome_manifest_url_handlers.h
new file mode 100644
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+++ b/chromium/chrome/common/extensions/chrome_manifest_url_handlers.h
@@ -0,0 +1,70 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_COMMON_EXTENSIONS_CHROME_MANIFEST_URL_HANDLERS_H_
+#define CHROME_COMMON_EXTENSIONS_CHROME_MANIFEST_URL_HANDLERS_H_
+
+#include <string>
+
+#include "base/macros.h"
+#include "extensions/common/extension.h"
+#include "extensions/common/manifest_handler.h"
+
+// Chrome-specific extension manifest URL handlers.
+
+namespace extensions {
+
+namespace chrome_manifest_urls {
+const GURL& GetDevToolsPage(const Extension* extension);
+}
+
+// Stores Chrome URL overrides specified in extensions manifests.
+struct URLOverrides : public Extension::ManifestData {
+  typedef std::map<const std::string, GURL> URLOverrideMap;
+
+  URLOverrides();
+  ~URLOverrides() override;
+
+  static const URLOverrideMap& GetChromeURLOverrides(
+      const Extension* extension);
+
+  // A map of chrome:// hostnames (newtab, downloads, etc.) to Extension URLs
+  // which override the handling of those URLs. (see ExtensionOverrideUI).
+  URLOverrideMap chrome_url_overrides_;
+};
+
+// Parses the "devtools_page" manifest key.
+class DevToolsPageHandler : public ManifestHandler {
+ public:
+  DevToolsPageHandler();
+  ~DevToolsPageHandler() override;
+
+  bool Parse(Extension* extension, base::string16* error) override;
+
+ private:
+  base::span<const char* const> Keys() const override;
+
+  DISALLOW_COPY_AND_ASSIGN(DevToolsPageHandler);
+};
+
+// Parses the "chrome_url_overrides" manifest key.
+class URLOverridesHandler : public ManifestHandler {
+ public:
+  URLOverridesHandler();
+  ~URLOverridesHandler() override;
+
+  bool Parse(Extension* extension, base::string16* error) override;
+  bool Validate(const Extension* extension,
+                std::string* error,
+                std::vector<InstallWarning>* warnings) const override;
+
+ private:
+  base::span<const char* const> Keys() const override;
+
+  DISALLOW_COPY_AND_ASSIGN(URLOverridesHandler);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_COMMON_EXTENSIONS_CHROME_MANIFEST_URL_HANDLERS_H_