ui: Make gfx::Size::Scale() mutate the class. Add gfx::ScaleSize() similar to Rect/Point.

chrome/browser/thumbnails/render_widget_snapshot_taker.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 "chrome/browser/thumbnails/render_widget_snapshot_taker.h"
 
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_source.h"
@@ skipping 30 matching lines @@
     const SnapshotReadyCallback& callback,
     gfx::Size page_size,
     gfx::Size desired_size) {
   // We are going to render the thumbnail asynchronously now, so keep
   // this callback for later lookup when the rendering is done.
   static int sequence_num = 0;
   sequence_num++;
   float scale_factor = ui::GetScaleFactorScale(ui::GetScaleFactorForNativeView(
       renderer->GetView()->GetNativeView()));
   gfx::Size desired_size_in_pixel = gfx::ToFlooredSize(
-      desired_size.Scale(scale_factor));
+      gfx::ScaleSize(desired_size, scale_factor));
   scoped_ptr<TransportDIB> thumbnail_dib(TransportDIB::Create(
       desired_size_in_pixel.GetArea() * 4, sequence_num));
 
 #if defined(USE_X11)
   // TODO: IPC a handle to the renderer like Windows.
   // http://code.google.com/p/chromium/issues/detail?id=89777
   NOTIMPLEMENTED();
   return;
 #else
 
@@ skipping 122 matching lines @@
     int new_count = --host_monitor_counts_[renderer];
     if (new_count == 0) {
       host_monitor_counts_.erase(renderer);
       registrar_.Remove(
           this,
           content::NOTIFICATION_RENDER_WIDGET_HOST_DID_RECEIVE_PAINT_AT_SIZE_ACK,
           renderer_source);
     }
   }
 }