Revert of Change WebContents::last_active_time_ to Time instead of Timeticks.

content/browser/web_contents/web_contents_impl.h

 // 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 CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 257 matching lines @@
   void IncrementCapturerCount(const gfx::Size& capture_size) override;
   void DecrementCapturerCount() override;
   int GetCapturerCount() const override;
   bool IsAudioMuted() const override;
   void SetAudioMuted(bool mute) override;
   bool IsCrashed() const override;
   void SetIsCrashed(base::TerminationStatus status, int error_code) override;
   base::TerminationStatus GetCrashedStatus() const override;
   bool IsBeingDestroyed() const override;
   void NotifyNavigationStateChanged(InvalidateTypes changed_flags) override;
-  base::Time GetLastActiveTime() const override;
+  base::TimeTicks GetLastActiveTime() const override;
   void WasShown() override;
   void WasHidden() override;
   bool NeedToFireBeforeUnload() override;
   void DispatchBeforeUnload(bool for_cross_site_transition) override;
   void Stop() override;
   WebContents* Clone() override;
   void ReloadFocusedFrame(bool ignore_cache) override;
   void Undo() override;
   void Redo() override;
   void Cut() override;
@@ skipping 853 matching lines @@
   // Set to true when there is an active "before unload" dialog.  When true,
   // we've forced the throbber to start in Navigate, and we need to remember to
   // turn it off in OnJavaScriptMessageBoxClosed if the navigation is canceled.
   bool is_showing_before_unload_dialog_;
 
   // Settings that get passed to the renderer process.
   RendererPreferences renderer_preferences_;
 
   // The time that this WebContents was last made active. The initial value is
   // the WebContents creation time.
-  base::Time last_active_time_;
+  base::TimeTicks last_active_time_;
 
   // See description above setter.
   bool closed_by_user_gesture_;
 
   // Minimum/maximum zoom percent.
   int minimum_zoom_percent_;
   int maximum_zoom_percent_;
 
   // The intrinsic size of the page.
   gfx::Size preferred_size_;
@@ skipping 122 matching lines @@
   // Adds/removes a callback called on creation of each new WebContents.
   static void AddCreatedCallbackForTesting(const CreatedCallback& callback);
   static void RemoveCreatedCallbackForTesting(const CreatedCallback& callback);
 
   DISALLOW_COPY_AND_ASSIGN(FriendZone);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_