Remove Tabpose feature on mac, and supporting infrastructure (PaintAtSize)

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 "chrome/browser/browser_process.h"
 #include "chrome/browser/profiles/profile.h"
-#include "chrome/browser/thumbnails/render_widget_snapshot_taker.h"
 #include "chrome/browser/thumbnails/thumbnail_service.h"
 #include "chrome/browser/thumbnails/thumbnail_service_factory.h"
 #include "chrome/browser/thumbnails/thumbnailing_algorithm.h"
 #include "chrome/browser/thumbnails/thumbnailing_context.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_source.h"
 #include "content/public/browser/notification_types.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "ui/gfx/color_utils.h"
@@ skipping 137 matching lines @@
         WidgetHidden(content::Source<RenderWidgetHost>(source).ptr());
       break;
 
     default:
       NOTREACHED() << "Unexpected notification type: " << type;
   }
 }
 
 void ThumbnailTabHelper::RenderViewDeleted(
     content::RenderViewHost* render_view_host) {
-  g_browser_process->GetRenderWidgetSnapshotTaker()->CancelSnapshot(
-      render_view_host);
-
   bool registered = registrar_.IsRegistered(
       this,
       content::NOTIFICATION_RENDER_WIDGET_VISIBILITY_CHANGED,
       content::Source<RenderWidgetHost>(render_view_host));
   if (registered) {
     registrar_.Remove(
         this,
         content::NOTIFICATION_RENDER_WIDGET_VISIBILITY_CHANGED,
         content::Source<RenderWidgetHost>(render_view_host));
   }
@@ skipping 57 matching lines @@
         content::NOTIFICATION_RENDER_WIDGET_VISIBILITY_CHANGED,
         content::Source<RenderWidgetHost>(renderer));
   }
 }
 
 void ThumbnailTabHelper::WidgetHidden(RenderWidgetHost* widget) {
   if (!enabled_)
     return;
   UpdateThumbnailIfNecessary(web_contents());
 }