Extend the ToRenderFrameHost magic to FrameTreeNode* and Shell*

content/browser/media/webrtc/webrtc_webcam_browsertest.cc

 // Copyright 2014 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 "base/command_line.h"
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/test/browser_test_utils.h"
@@ skipping 60 matching lines @@
 // Android bots will run the test since they ignore MANUAL, but that's what we
 // want here since the bot runs tests sequentially on the device.
 IN_PROC_BROWSER_TEST_F(WebRtcWebcamBrowserTest,
                        MANUAL_CanAcquireVgaOnRealWebcam) {
   ASSERT_TRUE(embedded_test_server()->Start());
   GURL url(embedded_test_server()->GetURL(
       "/media/getusermedia-real-webcam.html"));
   NavigateToURL(shell(), url);
 
   std::string result;
-  ASSERT_TRUE(ExecuteScriptAndExtractString(shell()->web_contents(),
-                                            "hasVideoInputDeviceOnSystem()",
-                                            &result));
+  ASSERT_TRUE(ExecuteScriptAndExtractString(
+      shell(), "hasVideoInputDeviceOnSystem()", &result));
   if (result != "has-video-input-device") {
     VLOG(0) << "No video device; skipping test...";
     return;
   }
 
   // GetUserMedia should acquire VGA by default.
   ASSERT_TRUE(ExecuteScriptAndExtractString(
-      shell()->web_contents(),
-      "getUserMediaAndReturnVideoDimensions({video: true})",
-      &result));
+      shell(), "getUserMediaAndReturnVideoDimensions({video: true})", &result));
 
   if (result == "640x480" || result == "480x640") {
     // Don't care if the device happens to be in landscape or portrait mode
     // since we don't know how it is oriented in the lab :)
     return;
   }
   FAIL() << "Expected resolution to be 640x480 or 480x640, got" << result;
 }
 
 }  // namespace content