Remove SetAllowOverlappingView from RWHVMac

content/browser/renderer_host/render_widget_host_view_mac.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.
 
 #include "content/browser/renderer_host/render_widget_host_view_mac.h"
 
 #import <objc/runtime.h>
 #include <OpenGL/gl.h>
 #include <QuartzCore/QuartzCore.h>
 
@@ skipping 559 matching lines @@
   // us.
   if (render_widget_host_)
     render_widget_host_->SetView(NULL);
 }
 
 void RenderWidgetHostViewMac::SetDelegate(
     NSObject<RenderWidgetHostViewMacDelegate>* delegate) {
   [cocoa_view_ setResponderDelegate:delegate];
 }
 
-void RenderWidgetHostViewMac::SetAllowOverlappingViews(bool overlapping) {
-  // TODO(ccameron): Remove callers of this function.
-}
-
 void RenderWidgetHostViewMac::SetAllowPauseForResizeOrRepaint(bool allow) {
   allow_pause_for_resize_or_repaint_ = allow;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 // RenderWidgetHostViewMac, RenderWidgetHostView implementation:
 
 bool RenderWidgetHostViewMac::EnsureCompositedIOSurface() {
   // If the context or the IOSurface's context has had an error, re-build
   // everything from scratch.
@@ skipping 3500 matching lines @@
 
 // "-webkit-app-region: drag | no-drag" is implemented on Mac by excluding
 // regions that are not draggable. (See ControlRegionView in
 // native_app_window_cocoa.mm). This requires the render host view to be
 // draggable by default.
 - (BOOL)mouseDownCanMoveWindow {
   return YES;
 }
 
 @end