Use TimeTicks as much as possible in startup_metric_utils.

chrome/browser/ui/browser.cc

 // Copyright 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.
 
 #include "chrome/browser/ui/browser.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <shellapi.h>
 #endif  // defined(OS_WIN)
@@ skipping 1405 matching lines @@
 
 bool Browser::IsMouseLocked() const {
   return exclusive_access_manager_->mouse_lock_controller()->IsMouseLocked();
 }
 
 void Browser::OnWindowDidShow() {
   if (window_has_shown_)
     return;
   window_has_shown_ = true;
 
-  startup_metric_utils::RecordBrowserWindowDisplay(base::Time::Now());
+  startup_metric_utils::RecordBrowserWindowDisplay(base::TimeTicks::Now());
 
   // Nothing to do for non-tabbed windows.
   if (!is_type_tabbed())
     return;
 
   // Show any pending global error bubble.
   GlobalErrorService* service =
       GlobalErrorServiceFactory::GetForProfile(profile());
   GlobalError* error = service->GetFirstGlobalErrorWithBubbleView();
   if (error)
@@ skipping 1266 matching lines @@
   if (contents && !allow_js_access) {
     contents->web_contents()->GetController().LoadURL(
         target_url,
         content::Referrer(),
         ui::PAGE_TRANSITION_LINK,
         std::string());  // No extra headers.
   }
 
   return contents != NULL;
 }