Remove screen capturers from media/video/capture/screen.

media/video/capture/screen/differ_block.h

Index: media/video/capture/screen/differ_block.h
diff --git a/media/video/capture/screen/differ_block.h b/media/video/capture/screen/differ_block.h
deleted file mode 100644
index 8b211e2e65d2d887fb22ee51e6b9fca022375213..0000000000000000000000000000000000000000
--- a/media/video/capture/screen/differ_block.h
+++ /dev/null
@@ -1,28 +0,0 @@
-// Copyright (c) 2011 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.
-
-#ifndef MEDIA_VIDEO_CAPTURE_SCREEN_DIFFER_BLOCK_H_
-#define MEDIA_VIDEO_CAPTURE_SCREEN_DIFFER_BLOCK_H_
-
-#include "base/basictypes.h"
-#include "media/base/media_export.h"
-
-namespace media {
-
-// Size (in pixels) of each square block used for diffing. This must be a
-// multiple of sizeof(uint64)/8.
-const int kBlockSize = 32;
-
-// Format: BGRA 32 bit.
-const int kBytesPerPixel = 4;
-
-// Low level functions to compare 2 blocks of pixels. Zero means the blocks
-// are identical. One - the blocks are different.
-MEDIA_EXPORT int BlockDifference(const uint8* image1,
-                                 const uint8* image2,
-                                 int stride);
-
-}  // namespace media
-
-#endif  // MEDIA_VIDEO_CAPTURE_SCREEN_DIFFER_BLOCK_H_