VideoCaptureBufferPool: Refactor to allow support of non-ShMem backed buffers

media/video/capture/fake_video_capture_device.cc

Index: media/video/capture/fake_video_capture_device.cc
diff --git a/media/video/capture/fake_video_capture_device.cc b/media/video/capture/fake_video_capture_device.cc
index 5e5c387427c3c3060dff0a35f2865f638c0ab097..819cc7c9c4dba08d63a7a0a27345a7a9da1d14d9 100644
--- a/media/video/capture/fake_video_capture_device.cc
+++ b/media/video/capture/fake_video_capture_device.cc
@@ -156,8 +156,7 @@ void FakeVideoCaptureDevice::CaptureUsingClientBuffers() {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   const scoped_refptr<VideoCaptureDevice::Client::Buffer> capture_buffer =
-      client_->ReserveOutputBuffer(VideoFrame::I420,
-                                   capture_format_.frame_size);
+      client_->ReserveOutputBuffer(capture_format_);
   DLOG_IF(ERROR, !capture_buffer) << "Couldn't allocate Capture Buffer";
   if (!capture_buffer)
     return;