Fix use-after-move in media/webrtc permission prompting code

chrome/browser/media/webrtc/media_stream_devices_controller.cc

 // 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.
 
 #include "chrome/browser/media/webrtc/media_stream_devices_controller.h"
 
 #include <map>
 #include <utility>
 
 #include "base/callback_helpers.h"
@@ skipping 412 matching lines @@
   if (request.request_type == content::MEDIA_OPEN_DEVICE_PEPPER_ONLY) {
     MediaPermissionRequestLogger::LogRequest(
         web_contents, request.render_process_id, request.render_frame_id,
         content::IsOriginSecure(request.security_origin));
   }
 
   std::unique_ptr<MediaStreamDevicesController> controller(
       new MediaStreamDevicesController(web_contents, request, callback));
 
   // Show a prompt if needed.
-  if (controller->IsAskingForAudio() || controller->IsAskingForVideo()) {
+  bool is_asking_for_audio = controller->IsAskingForAudio();
+  bool is_asking_for_video = controller->IsAskingForVideo();
+  if (is_asking_for_audio || is_asking_for_video) {
     Profile* profile =
         Profile::FromBrowserContext(web_contents->GetBrowserContext());
     delegate->ShowPrompt(
         request.user_gesture, web_contents,
         base::MakeUnique<Request>(
-            profile, controller->IsAskingForAudio(),
-            controller->IsAskingForVideo(), request.security_origin,
+            profile, is_asking_for_audio, is_asking_for_video,
+            request.security_origin,
             base::Bind(&MediaStreamDevicesController::PromptAnswered,
                        base::Passed(&controller))));
     return;
   }
 
 #if defined(OS_ANDROID)
   // If either audio or video was previously allowed and Chrome no longer has
   // the necessary permissions, show a infobar to attempt to address this
   // mismatch.
   std::vector<ContentSettingsType> content_settings_types;
@@ skipping 275 matching lines @@
     }
   }
 
   // Don't approve device requests if the tab was hidden.
   // TODO(qinmin): Add a test for this. http://crbug.com/396869.
   // TODO(raymes): Shouldn't this apply to all permissions not just audio/video?
   return web_contents_->GetRenderWidgetHostView()->IsShowing();
 #endif
   return true;
 }