Check that render-frame is valid before returning audio params in Blink.

content/renderer/renderer_blink_platform_impl.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/renderer/renderer_blink_platform_impl.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 162 matching lines @@
 double g_test_device_light_data = -1;
 base::LazyInstance<blink::WebDeviceMotionData>::Leaky
     g_test_device_motion_data = LAZY_INSTANCE_INITIALIZER;
 base::LazyInstance<blink::WebDeviceOrientationData>::Leaky
     g_test_device_orientation_data = LAZY_INSTANCE_INITIALIZER;
 
 media::AudioParameters GetAudioHardwareParams() {
   blink::WebLocalFrame* const web_frame =
       blink::WebLocalFrame::frameForCurrentContext();
   RenderFrame* const render_frame = RenderFrame::FromWebFrame(web_frame);
+  if (!render_frame)
+    return media::AudioParameters::UnavailableDeviceParams();
+
   return AudioDeviceFactory::GetOutputDeviceInfo(render_frame->GetRoutingID(),
                                                  0, std::string(),
                                                  web_frame->getSecurityOrigin())
       .output_params();
 }
 
 }  // namespace
 
 //------------------------------------------------------------------------------
 
@@ skipping 1102 matching lines @@
   return &trial_token_validator_;
 }
 
 void RendererBlinkPlatformImpl::workerContextCreated(
     const v8::Local<v8::Context>& worker) {
   GetContentClient()->renderer()->DidInitializeWorkerContextOnWorkerThread(
       worker);
 }
 
 }  // namespace content