Add workaround for type change in webrtc api.

content/renderer/media/webrtc/webrtc_video_capturer_adapter_unittest.cc

 // Copyright 2014 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 <algorithm>
 
 #include "base/bind.h"
 #include "base/optional.h"
 #include "base/run_loop.h"
 #include "content/child/child_process.h"
@@ skipping 87 matching lines @@
 
     const int kInputWidth = 1280;
     const int kInputHeight = 720;
     const gfx::Size kSize(kInputWidth, kInputHeight);
     scoped_refptr<media::VideoFrame> frame = media::VideoFrame::CreateFrame(
         media::PIXEL_FORMAT_I420, kSize, gfx::Rect(kSize), kSize,
         base::TimeDelta());
 
     // Request smaller scale to make sure scaling normally kicks in.
     rtc::VideoSinkWants wants;
-    wants.max_pixel_count = rtc::Optional<int>(kInputWidth * kInputHeight / 2);
+    // TODO(sprang): Remove this type hack when webrtc has updated the sink
+    // wants api. https://codereview.webrtc.org/2781433002/
+    using MaxPixelCountType = decltype(wants.max_pixel_count);
+    wants.max_pixel_count = MaxPixelCountType(kInputWidth * kInputHeight / 2);
     adapter_->AddOrUpdateSink(this, wants);
 
     adapter_->OnFrameCaptured(frame);
     if (expect_initial_downscale) {
       EXPECT_LT(output_frame_width_, kInputWidth);
       EXPECT_LT(output_frame_height_, kInputHeight);
     } else {
       EXPECT_EQ(kInputWidth, output_frame_width_);
       EXPECT_EQ(kInputHeight, output_frame_height_);
     }
@@ skipping 69 matching lines @@
 
 TEST_F(WebRtcVideoCapturerAdapterTest, RespectsConstructionTimeContentHint) {
   // Non-screenshare adapter constructed with detail content hint should not
   // adapt before SetContentHint is run.
   TestContentHintResolutionAdaptation(
       false, blink::WebMediaStreamTrack::ContentHintType::VideoDetail, false,
       blink::WebMediaStreamTrack::ContentHintType::VideoMotion, true);
 }
 
 }  // namespace content