Remove SetAllowOverlappingView from RWHVMac

chrome/browser/ui/cocoa/tab_contents/tab_contents_controller.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/tab_contents/tab_contents_controller.h"
 
 #include <utility>
 
 #include "base/mac/scoped_cftyperef.h"
 #include "base/mac/scoped_nsobject.h"
@@ skipping 211 matching lines @@
   if ([subviews count] == 0) {
     [contentsContainer addSubview:contentsNativeView];
   } else if ([subviews objectAtIndex:0] != contentsNativeView) {
     [contentsContainer replaceSubview:[subviews objectAtIndex:0]
                                  with:contentsNativeView];
   }
   [contentsNativeView setAutoresizingMask:NSViewWidthSizable|
                                           NSViewHeightSizable];
 
   [contentsContainer setNeedsDisplay:YES];
-
-  // The rendering path with overlapping views disabled causes bugs when
-  // transitioning between composited and non-composited mode.
-  // http://crbug.com/279472
-  if (!fullscreenView)
-    contents_->SetAllowOverlappingViews(true);
 }
 
 - (void)changeWebContents:(WebContents*)newContents {
   contents_ = newContents;
   fullscreenObserver_->Observe(contents_);
   isEmbeddingFullscreenWidget_ =
       contents_ && contents_->GetFullscreenRenderWidgetHostView();
 }
 
 // Returns YES if the tab represented by this controller is the front-most.
@@ skipping 95 matching lines @@
     } else {
       rect.ClampToCenteredSize(gfx::Size(
           static_cast<int>(x / captureSize.height()), rect.height()));
     }
   }
 
   return NSRectFromCGRect(rect.ToCGRect());
 }
 
 @end