[content shell] move code common to several processes to a common dir

content/shell/shell_web_contents_view_delegate_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/shell/shell_web_contents_view_delegate.h"
 
 #import  <Cocoa/Cocoa.h>
 
 #include "base/command_line.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_view.h"
 #include "content/public/common/context_menu_params.h"
+#include "content/shell/common/shell_switches.h"
 #include "content/shell/shell.h"
 #include "content/shell/shell_browser_context.h"
 #include "content/shell/shell_browser_main_parts.h"
 #include "content/shell/shell_content_browser_client.h"
 #include "content/shell/shell_devtools_frontend.h"
-#include "content/shell/shell_switches.h"
 #include "content/shell/shell_web_contents_view_delegate_creator.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebContextMenuData.h"
 
 using WebKit::WebContextMenuData;
 
 enum {
   ShellContextMenuItemCutTag = 0,
   ShellContextMenuItemCopyTag,
   ShellContextMenuItemPasteTag,
   ShellContextMenuItemDeleteTag,
@@ skipping 237 matching lines @@
   return NULL;
 }
 
 NSObject<RenderWidgetHostViewMacDelegate>*
 ShellWebContentsViewDelegate::CreateRenderWidgetHostViewDelegate(
     content::RenderWidgetHost* render_widget_host) {
   return NULL;
 }
 
 }  // namespace content