Add a null check for PermissionBubbleManager::FromWebcontents.

chrome/browser/media/media_capture_devices_dispatcher.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/media_capture_devices_dispatcher.h"
 
 #include "apps/app_window.h"
 #include "apps/app_window_registry.h"
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 57 matching lines @@
 const content::MediaStreamDevice* FindDeviceWithId(
     const content::MediaStreamDevices& devices,
     const std::string& device_id) {
   content::MediaStreamDevices::const_iterator iter = devices.begin();
   for (; iter != devices.end(); ++iter) {
     if (iter->id == device_id) {
       return &(*iter);
     }
   }
   return NULL;
-};
+}
 
 // This is a short-term solution to grant camera and/or microphone access to
 // extensions:
 // 1. Virtual keyboard extension.
 // 2. Google Voice Search Hotword extension.
 // 3. Flutter gesture recognition extension.
 // 4. TODO(smus): Airbender experiment 1.
 // 5. TODO(smus): Airbender experiment 2.
 // Once http://crbug.com/292856 is fixed, remove this whitelist.
 bool IsMediaRequestWhitelistedForExtension(
@@ skipping 535 matching lines @@
   DCHECK(!it->second.empty());
 
   if (PermissionBubbleManager::Enabled()) {
     scoped_ptr<MediaStreamDevicesController> controller(
         new MediaStreamDevicesController(web_contents,
             it->second.front().request,
             base::Bind(&MediaCaptureDevicesDispatcher::OnAccessRequestResponse,
                        base::Unretained(this), web_contents)));
     if (controller->DismissInfoBarAndTakeActionOnSettings())
       return;
-    PermissionBubbleManager::FromWebContents(web_contents)->
-        AddRequest(controller.release());
+    PermissionBubbleManager* bubble_manager =
+        PermissionBubbleManager::FromWebContents(web_contents);
+    if (bubble_manager)
+      bubble_manager->AddRequest(controller.release());
     return;
   }
 
   // TODO(gbillock): delete this block and the MediaStreamInfoBarDelegate
   // when we've transitioned to bubbles. (crbug/337458)
   MediaStreamInfoBarDelegate::Create(
       web_contents, it->second.front().request,
       base::Bind(&MediaCaptureDevicesDispatcher::OnAccessRequestResponse,
                  base::Unretained(this), web_contents));
 }
@@ skipping 303 matching lines @@
 
 void MediaCaptureDevicesDispatcher::SetTestAudioCaptureDevices(
     const MediaStreamDevices& devices) {
   test_audio_devices_ = devices;
 }
 
 void MediaCaptureDevicesDispatcher::SetTestVideoCaptureDevices(
     const MediaStreamDevices& devices) {
   test_video_devices_ = devices;
 }