Mac: Remove white CALayers

chrome/browser/ui/cocoa/fast_resize_view.mm

 // Copyright (c) 2009 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/fast_resize_view.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/logging.h"
 #include "base/mac/scoped_nsobject.h"
 #include "ui/base/cocoa/animation_utils.h"
 
 @implementation FastResizeView
 
 - (id)initWithFrame:(NSRect)frameRect {
   if ((self = [super initWithFrame:frameRect])) {
     ScopedCAActionDisabler disabler;
     base::scoped_nsobject<CALayer> layer([[CALayer alloc] init]);
-    [layer setBackgroundColor:CGColorGetConstantColor(kCGColorWhite)];
     [self setLayer:layer];
     [self setWantsLayer:YES];
   }
   return self;
 }
 
 - (BOOL)isOpaque {
   return YES;
 }
 
 // Override -[NSView hitTest:] to prevent mouse events reaching subviews while
 // the window is displaying a modal sheet. Without this, context menus can be
 // shown on a right-click and trigger all kinds of things (e.g. Print).
 - (NSView*)hitTest:(NSPoint)aPoint {
   if ([[self window] attachedSheet])
     return self;
   return [super hitTest:aPoint];
 }
 
 @end