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

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 269b4716ef5394cf4896845482aea7f809d24a7c..abf7e4bc9e50a2f0cb90453b9f37f9bc9d6a7786 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -321,7 +321,7 @@
       notify_disconnection_(false),
       dialog_manager_(NULL),
       is_showing_before_unload_dialog_(false),
-      last_active_time_(base::Time::Now()),
+      last_active_time_(base::TimeTicks::Now()),
       closed_by_user_gesture_(false),
       minimum_zoom_percent_(static_cast<int>(kMinimumZoomFactor * 100)),
       maximum_zoom_percent_(static_cast<int>(kMaximumZoomFactor * 100)),
@@ -1053,7 +1053,7 @@
     delegate_->NavigationStateChanged(this, changed_flags);
 }
 
-base::Time WebContentsImpl::GetLastActiveTime() const {
+base::TimeTicks WebContentsImpl::GetLastActiveTime() const {
   return last_active_time_;
 }
 
@@ -1069,7 +1069,7 @@
     }
   }
 
-  last_active_time_ = base::Time::Now();
+  last_active_time_ = base::TimeTicks::Now();
 
   // The resize rect might have changed while this was inactive -- send the new
   // one to make sure it's up to date.