Use container::back() and container::pop_back() for content.

content/browser/renderer_host/render_widget_host_view_android.cc

 // 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.
 
 #include "content/browser/renderer_host/render_widget_host_view_android.h"
 
 #include <android/bitmap.h>
 
 #include <utility>
 
@@ skipping 943 matching lines @@
   host_->Send(new ViewMsg_ReclaimCompositorResources(host_->GetRoutingID(),
                                                      output_surface_id, ack));
 }
 
 void RenderWidgetHostViewAndroid::ReturnResources(
     const cc::ReturnedResourceArray& resources) {
   if (resources.empty())
     return;
   std::copy(resources.begin(), resources.end(),
             std::back_inserter(surface_returned_resources_));
-  if (!ack_callbacks_.size())
+  if (ack_callbacks_.empty())
     SendReturnedDelegatedResources(last_output_surface_id_);
 }
 
 void RenderWidgetHostViewAndroid::SetBeginFrameSource(
     cc::BeginFrameSource* begin_frame_source) {
   // TODO(tansell): Hook this up.
 }
 
 void RenderWidgetHostViewAndroid::DestroyDelegatedContent() {
   RemoveLayers();
@@ skipping 1015 matching lines @@
     case ui::MotionEvent::ACTION_UP:
     case ui::MotionEvent::ACTION_POINTER_UP:
       UMA_HISTOGRAM_CUSTOM_COUNTS("Event.Latency.OS.TOUCH_RELEASED",
                                   delta.InMicroseconds(), 1, 1000000, 50);
     default:
       return;
   }
 }
 
 }  // namespace content