MacViews: Guard Objective-C bits in content::WebContentsViewDelegate with __OBJC__

content/shell/browser/shell_web_contents_view_delegate_mac.mm

 // Copyright 2013 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/shell/browser/shell_web_contents_view_delegate.h"
 
 #import  <Cocoa/Cocoa.h>
 
 #include "base/command_line.h"
 #include "content/public/browser/render_frame_host.h"
@@ skipping 247 matching lines @@
       web_contents_->Focus();
       break;
     }
     case ShellContextMenuItemInspectTag: {
       ShellDevToolsFrontend::Show(web_contents_);
       break;
     }
   }
 }
 
-WebDragDestDelegate* ShellWebContentsViewDelegate::GetDragDestDelegate() {
-  return NULL;
-}
-
-NSObject<RenderWidgetHostViewMacDelegate>*
-ShellWebContentsViewDelegate::CreateRenderWidgetHostViewDelegate(
-    content::RenderWidgetHost* render_widget_host) {
-  return NULL;
-}
-
 }  // namespace content