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diff --git a/chromium/mojo/services/tracing/public/interfaces/tracing.mojom b/chromium/mojo/services/tracing/public/interfaces/tracing.mojom
deleted file mode 100644
index b624f81e24f..00000000000
--- a/chromium/mojo/services/tracing/public/interfaces/tracing.mojom
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@@ -1,62 +0,0 @@
-// Copyright 2014 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.
-
-module tracing;
-
-// To participate in the tracing ecosystem, implement the TraceProvider
-// interface and connect to the tracing app. Then, when the provider's Start()
-// function is called collect tracing data and pass it back via the provided
-// TraceRecorder interface up until Stop() is called.
-
-interface TraceProvider {
-  // Categories can either be the empty string to mean the default set of
-  // categories or a comma-delimited list of categories to trace.
-  StartTracing(string categories, TraceRecorder recorder);
-  StopTracing();
-};
-
-interface TraceRecorder {
-  Record(string json);
-};
-
-interface TraceCollector {
-  // Request tracing data from all connected providers to stream to
-  // |stream|.
-  Start(handle<data_pipe_producer> stream, string categories);
-
-  // Stop tracing and flush results to the |stream| passed in to Start().
-  // Closes |stream| when all data is collected.
-  StopAndFlush();
-};
-
-// These times are used to determine startup performance metrics.
-// TODO(msw): Find a way to convert *_time metrics into TimeTicks earlier (ref:
-// https://goo.gl/vZ8dZW).
-struct StartupPerformanceTimes {
-  // TODO(msw): Rename to match "BrowserMainEntryTimeAbsolute" metric?
-  int64 shell_process_creation_time;
-  int64 shell_main_entry_point_time;
-  int64 browser_message_loop_start_ticks;
-  int64 browser_window_display_ticks;
-  int64 browser_open_tabs_time_delta;
-  // TODO(msw): Rename to avoid "web contents"?
-  int64 first_web_contents_main_frame_load_ticks;
-  // TODO(msw): Rename to match "FirstWebContents.NonEmptyPaint" metric?
-  int64 first_visually_non_empty_layout_ticks;
-};
-
-// This interface accepts startup performance timing from a variety of sources.
-interface StartupPerformanceDataCollector {
-  // These setters may be called many times, only the first time is recorded.
-  SetShellProcessCreationTime(int64 time);
-  SetShellMainEntryPointTime(int64 time);
-  SetBrowserMessageLoopStartTicks(int64 ticks);
-  SetBrowserWindowDisplayTicks(int64 ticks);
-  SetBrowserOpenTabsTimeDelta(int64 delta);
-  SetFirstWebContentsMainFrameLoadTicks(int64 ticks);
-  SetFirstVisuallyNonEmptyLayoutTicks(int64 ticks);
-
-  // Get the currently available startup performance times.
-  GetStartupPerformanceTimes() => (StartupPerformanceTimes times);
-};