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

content/public/browser/content_browser_client.cc

Index: content/public/browser/content_browser_client.cc
diff --git a/content/public/browser/content_browser_client.cc b/content/public/browser/content_browser_client.cc
index 72349d5962944844793c44ef28d02d0966959298..27ebe56123de8326d9c3434d4fffdd092749907b 100644
--- a/content/public/browser/content_browser_client.cc
+++ b/content/public/browser/content_browser_client.cc
@@ -246,6 +246,11 @@ BrowserPpapiHost*
   return NULL;
 }
 
+bool ContentBrowserClient::SupportsBrowserPlugin(
+    BrowserContext* browser_context, const GURL& site_url) {
+  return false;
+}
+
 bool ContentBrowserClient::AllowPepperSocketAPI(
     BrowserContext* browser_context,
     const GURL& url,