Move Sad Tab implementation out of the TabContentsViews.

content/browser/renderer_host/render_widget_host_view_mac.mm

 // Copyright (c) 2011 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_mac.h"
 
 #include <QuartzCore/QuartzCore.h>
 
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
@@ skipping 561 matching lines @@
   // If |about_to_validate_and_paint_| is set, then -drawRect: is on the stack
   // and it's not allowed to call -setHidden on the accelerated view.  In that
   // case, -callSetNeedsDisplayInRect: will hide it later.
   // If |about_to_validate_and_paint_| is not set, do it now.
   if (!about_to_validate_and_paint_)
     HandleDelayedGpuViewHiding();
 }
 
 void RenderWidgetHostViewMac::RenderViewGone(base::TerminationStatus status,
                                              int error_code) {
-  // TODO(darin): keep this around, and draw sad-tab into it.
   Destroy();
 }
 
 void RenderWidgetHostViewMac::Destroy() {
   // On Windows, popups are implemented with a popup window style, so that when
   // an event comes in that would "cancel" it, it receives the OnCancelMode
   // message and can kill itself. Alas, on the Mac, views cannot capture events
   // outside of themselves. On Windows, if Destroy is being called on a view,
   // then the event causing the destroy had also cancelled any popups by the
   // time Destroy() was called. On the Mac we have to destroy all the popups
@@ skipping 2156 matching lines @@
   if (!string) return NO;
 
   // If the user is currently using an IME, confirm the IME input,
   // and then insert the text from the service, the same as TextEdit and Safari.
   [self confirmComposition];
   [self insertText:string];
   return YES;
 }
 
 @end