Stop assuming anything about result of MFStartup()

media/gpu/media_foundation_video_encode_accelerator_win.cc

 // Copyright 2016 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 "media/gpu/media_foundation_video_encode_accelerator_win.h"
 
 #pragma warning(push)
 #pragma warning(disable : 4800)  // Disable warning for added padding.
 
 #include <codecapi.h>
@@ skipping 319 matching lines @@
     return false;
   }
 
   for (const wchar_t* mfdll : kMediaFoundationVideoEncoderDLLs) {
     if (!::GetModuleHandle(mfdll)) {
       DVLOG(ERROR) << mfdll << " is required for encoding";
       return false;
     }
   }
 
-  InitializeMediaFoundation();
+  if (!InitializeMediaFoundation())
+    return false;
 
   uint32_t flags = MFT_ENUM_FLAG_HARDWARE | MFT_ENUM_FLAG_SORTANDFILTER;
   MFT_REGISTER_TYPE_INFO input_info;
   input_info.guidMajorType = MFMediaType_Video;
   input_info.guidSubtype = MFVideoFormat_NV12;
   MFT_REGISTER_TYPE_INFO output_info;
   output_info.guidMajorType = MFMediaType_Video;
   output_info.guidSubtype = MFVideoFormat_H264;
 
   base::win::ScopedCoMem<CLSID> CLSIDs;
@@ skipping 344 matching lines @@
 void MediaFoundationVideoEncodeAccelerator::ReleaseEncoderResources() {
   encoder_.Release();
   codec_api_.Release();
   imf_input_media_type_.Release();
   imf_output_media_type_.Release();
   input_sample_.Release();
   output_sample_.Release();
 }
 
 }  // namespace content