VideoCaptureHost: Remove |controllers_| entry before calling VideoCaptureManager::StopCaptureForCli…

content/browser/renderer_host/media/video_capture_host.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 "content/browser/renderer_host/media/video_capture_host.h"
 
 #include <memory>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 278 matching lines @@
 }
 
 void VideoCaptureHost::DeleteVideoCaptureController(
     VideoCaptureControllerID controller_id, bool on_error) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   auto it = controllers_.find(controller_id);
   if (it == controllers_.end())
     return;
 
-  if (it->second) {
-    media_stream_manager_->video_capture_manager()->StopCaptureForClient(
-        it->second.get(), controller_id, this, on_error);
-  }
+  const base::WeakPtr<VideoCaptureController> controller = it->second;
   controllers_.erase(it);
+  if (!controller)
+    return;
+
+  media_stream_manager_->video_capture_manager()->StopCaptureForClient(
+      controller.get(), controller_id, this, on_error);
 }
 
 }  // namespace content