EVEA cleanup: use video utility functions in media::*

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 665f728b3c66ffb4fbda40f1cc1c6f5479740364..6bf83a6460fce496f8fe51f03c3449e04e8b5645 100644
--- a/media/video/capture/fake_video_capture_device.cc
+++ b/media/video/capture/fake_video_capture_device.cc
@@ -91,8 +91,9 @@ void FakeVideoCaptureDevice::Allocate(
     capture_format_.frame_rate = 30;
   }
 
-  size_t fake_frame_size =
-      capture_format_.width * capture_format_.height * 3 / 2;
+  const size_t fake_frame_size = VideoFrame::AllocationSize(
+      VideoFrame::I420,
+      gfx::Size(capture_format_.width, capture_format_.height));
   fake_frame_.reset(new uint8[fake_frame_size]);
 
   state_ = kAllocated;
@@ -107,8 +108,9 @@ void FakeVideoCaptureDevice::Reallocate() {
   DVLOG(3) << "Reallocating FakeVideoCaptureDevice, new capture resolution ("
            << capture_format_.width << "x" << capture_format_.height << ")";
 
-  size_t fake_frame_size =
-      capture_format_.width * capture_format_.height * 3 / 2;
+  const size_t fake_frame_size = VideoFrame::AllocationSize(
+      VideoFrame::I420,
+      gfx::Size(capture_format_.width, capture_format_.height));
   fake_frame_.reset(new uint8[fake_frame_size]);
 
   observer_->OnFrameInfoChanged(capture_format_);
@@ -151,7 +153,9 @@ void FakeVideoCaptureDevice::OnCaptureTask() {
     return;
   }
 
-  int frame_size = capture_format_.width * capture_format_.height * 3 / 2;
+  const size_t frame_size = VideoFrame::AllocationSize(
+      VideoFrame::I420,
+      gfx::Size(capture_format_.width, capture_format_.height));
   memset(fake_frame_.get(), 0, frame_size);
 
   SkBitmap bitmap;