Browser Plugin: Only install BrowserPluginMessageFilter if render process supports BrowserPlugin.

chrome/browser/chrome_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 CHROME_BROWSER_CHROME_CONTENT_BROWSER_CLIENT_H_
 #define CHROME_BROWSER_CHROME_CONTENT_BROWSER_CLIENT_H_
 
 #include <set>
 #include <string>
 #include <utility>
@@ skipping 193 matching lines @@
   virtual void BrowserURLHandlerCreated(
       content::BrowserURLHandler* handler) OVERRIDE;
   virtual void ClearCache(content::RenderViewHost* rvh) OVERRIDE;
   virtual void ClearCookies(content::RenderViewHost* rvh) OVERRIDE;
   virtual base::FilePath GetDefaultDownloadDirectory() OVERRIDE;
   virtual std::string GetDefaultDownloadName() OVERRIDE;
   virtual void DidCreatePpapiPlugin(
       content::BrowserPpapiHost* browser_host) OVERRIDE;
   virtual content::BrowserPpapiHost* GetExternalBrowserPpapiHost(
       int plugin_process_id) OVERRIDE;
+  virtual bool SupportsBrowserPlugin(content::BrowserContext* browser_context,
+                                     const GURL& site_url) OVERRIDE;
   virtual bool AllowPepperSocketAPI(
       content::BrowserContext* browser_context,
       const GURL& url,
       const content::SocketPermissionRequest& params) OVERRIDE;
   virtual base::FilePath GetHyphenDictionaryDirectory() OVERRIDE;
   virtual ui::SelectFilePolicy* CreateSelectFilePolicy(
       content::WebContents* web_contents) OVERRIDE;
 
 #if defined(OS_POSIX) && !defined(OS_MACOSX)
   virtual void GetAdditionalMappedFilesForChildProcess(
@@ skipping 26 matching lines @@
   // Cached version of the locale so we can return the locale on the I/O
   // thread.
   std::string io_thread_application_locale_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeContentBrowserClient);
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_CHROME_CONTENT_BROWSER_CLIENT_H_