Add context popup menu support for content shell[GTK].

content/shell/shell_content_browser_client.h

 // 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.
 
 #ifndef CONTENT_SHELL_SHELL_CONTENT_BROWSER_CLIENT_H_
 #define CONTENT_SHELL_SHELL_CONTENT_BROWSER_CLIENT_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 14 matching lines @@
   // ContentBrowserClient overrides.
   virtual BrowserMainParts* CreateBrowserMainParts(
       const MainFunctionParams& parameters) OVERRIDE;
   virtual void RenderViewHostCreated(
       RenderViewHost* render_view_host) OVERRIDE;
   virtual void AppendExtraCommandLineSwitches(CommandLine* command_line,
                                               int child_process_id) OVERRIDE;
   virtual void ResourceDispatcherHostCreated() OVERRIDE;
   virtual AccessTokenStore* CreateAccessTokenStore() OVERRIDE;
   virtual std::string GetDefaultDownloadName() OVERRIDE;
+  virtual WebContentsViewDelegate* GetWebContentsViewDelegate(
+      WebContents* web_contents) OVERRIDE;
 
 #if defined(OS_ANDROID)
   virtual void GetAdditionalMappedFilesForChildProcess(
       const CommandLine& command_line,
       base::GlobalDescriptors::Mapping* mappings) OVERRIDE;
 #endif
 
   ShellBrowserContext* browser_context();
   ShellBrowserContext* off_the_record_browser_context();
   ShellResourceDispatcherHostDelegate* resource_dispatcher_host_delegate() {
     return resource_dispatcher_host_delegate_.get();
   }
   ShellBrowserMainParts* shell_browser_main_parts() {
     return shell_browser_main_parts_;
   }
 
  private:
   scoped_ptr<ShellResourceDispatcherHostDelegate>
       resource_dispatcher_host_delegate_;
 
   ShellBrowserMainParts* shell_browser_main_parts_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_SHELL_CONTENT_BROWSER_CLIENT_H_