Support webview tag when the container extension is embedded in a webUI

chrome/renderer/chrome_content_renderer_client.h

Index: chrome/renderer/chrome_content_renderer_client.h
diff --git a/chrome/renderer/chrome_content_renderer_client.h b/chrome/renderer/chrome_content_renderer_client.h
index 1885c57be55e4a4372d0a2a436fe57dd0eec4793..599c5e8b584c83ed76148ecbd3d043dfe230b49d 100644
--- a/chrome/renderer/chrome_content_renderer_client.h
+++ b/chrome/renderer/chrome_content_renderer_client.h
@@ -173,7 +173,9 @@ class ChromeContentRendererClient : public content::ContentRendererClient {
  private:
   FRIEND_TEST_ALL_PREFIXES(ChromeContentRendererClientTest, NaClRestriction);
 
-  const extensions::Extension* GetExtension(
+  // Gets extension by the given origin, regardless of whether the extension
+  // is active in the current process.
+  const extensions::Extension* GetExtensionByOrigin(
       const WebKit::WebSecurityOrigin& origin) const;
 
   // Returns true if the frame is navigating to an URL either into or out of an