Remove a unused gfx::Size from ThumbnailTabHelper::AsyncProcessThumbnail()

chrome/browser/thumbnails/thumbnail_tab_helper.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/thumbnail_tab_helper.h"
 
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/thumbnails/thumbnail_service.h"
@@ skipping 136 matching lines @@
       web_contents()->GetRenderViewHost()->GetWidget();
   content::RenderWidgetHostView* view = render_widget_host->GetView();
   if (!view || !view->IsSurfaceAvailableForCopy()) {
     return;
   }
 
   gfx::Rect copy_rect = gfx::Rect(view->GetViewBounds().size());
   // Clip the pixels that will commonly hold a scrollbar, which looks bad in
   // thumbnails.
   int scrollbar_size = gfx::scrollbar_size();
-  gfx::Size copy_size;
   copy_rect.Inset(0, 0, scrollbar_size, scrollbar_size);
 
   if (copy_rect.IsEmpty()) {
     return;
   }
 
   scoped_refptr<thumbnails::ThumbnailingAlgorithm> algorithm(
       thumbnail_service->GetThumbnailingAlgorithm());
 
   thumbnailing_context_ = new ThumbnailingContext(web_contents(),
@@ skipping 67 matching lines @@
       content::Source<RenderWidgetHost>(renderer->GetWidget()));
   if (!registered) {
     registrar_.Add(this, content::NOTIFICATION_RENDER_WIDGET_VISIBILITY_CHANGED,
                    content::Source<RenderWidgetHost>(renderer->GetWidget()));
   }
 }
 
 void ThumbnailTabHelper::WidgetHidden(RenderWidgetHost* widget) {
   UpdateThumbnailIfNecessary();
 }