Use webrtc::DesktopCapturer for screen capturer implementation.

media/video/capture/screen/screen_capture_frame.cc

Index: media/video/capture/screen/screen_capture_frame.cc
diff --git a/media/video/capture/screen/screen_capture_frame.cc b/media/video/capture/screen/screen_capture_frame.cc
deleted file mode 100644
index 4da28eba1547e4ffa3d12140e2f1a5ff9fb6415d..0000000000000000000000000000000000000000
--- a/media/video/capture/screen/screen_capture_frame.cc
+++ /dev/null
@@ -1,18 +0,0 @@
-// 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 "media/video/capture/screen/screen_capture_frame.h"
-
-namespace media {
-
-ScreenCaptureFrame::~ScreenCaptureFrame() {
-}
-
-ScreenCaptureFrame::ScreenCaptureFrame()
-    : bytes_per_row_(0),
-      dimensions_(SkISize::Make(0, 0)),
-      pixels_(NULL) {
-}
-
-}  // namespace media