Use webrtc::DesktopCapturer for screen capturer implementation.

media/media.gyp

Index: media/media.gyp
diff --git a/media/media.gyp b/media/media.gyp
index 5f38e3efcc86553e68e0682a3d6ae72853f89f79..489001eef20eeba180e6794867e2d81a14a4efa4 100644
--- a/media/media.gyp
+++ b/media/media.gyp
@@ -50,6 +50,7 @@
         '../crypto/crypto.gyp:crypto',
         '../skia/skia.gyp:skia',
         '../third_party/opus/opus.gyp:opus',
+        '../third_party/webrtc/modules/modules.gyp:desktop_capture',
         '../ui/ui.gyp:ui',
       ],
       'defines': [
@@ -374,12 +375,8 @@
         'video/capture/screen/mac/scoped_pixel_buffer_object.h',
         'video/capture/screen/mouse_cursor_shape.cc',
         'video/capture/screen/mouse_cursor_shape.h',
-        'video/capture/screen/screen_capture_data.cc',
-        'video/capture/screen/screen_capture_data.h',
         'video/capture/screen/screen_capture_device.cc',
         'video/capture/screen/screen_capture_device.h',
-        'video/capture/screen/screen_capture_frame.cc',
-        'video/capture/screen/screen_capture_frame.h',
         'video/capture/screen/screen_capture_frame_queue.cc',
         'video/capture/screen/screen_capture_frame_queue.h',
         'video/capture/screen/screen_capturer.h',
@@ -391,8 +388,6 @@
         'video/capture/screen/screen_capturer_mac.mm',
         'video/capture/screen/screen_capturer_null.cc',
         'video/capture/screen/screen_capturer_win.cc',
-        'video/capture/screen/shared_buffer.cc',
-        'video/capture/screen/shared_buffer.h',
         'video/capture/screen/win/desktop.cc',
         'video/capture/screen/win/desktop.h',
         'video/capture/screen/win/scoped_thread_desktop.cc',
@@ -917,6 +912,7 @@
         '../testing/gmock.gyp:gmock',
         '../testing/gtest.gyp:gtest',
         '../ui/ui.gyp:ui',
+        '../third_party/webrtc/modules/modules.gyp:desktop_capture',
       ],
       'sources': [
         'audio/async_socket_io_handler_unittest.cc',
@@ -1006,7 +1002,6 @@
         'filters/video_renderer_base_unittest.cc',
         'video/capture/screen/differ_block_unittest.cc',
         'video/capture/screen/differ_unittest.cc',
-        'video/capture/screen/shared_buffer_unittest.cc',
         'video/capture/screen/screen_capture_device_unittest.cc',
         'video/capture/screen/screen_capturer_helper_unittest.cc',
         'video/capture/screen/screen_capturer_mac_unittest.cc',
@@ -1142,6 +1137,7 @@
         '../skia/skia.gyp:skia',
         '../testing/gmock.gyp:gmock',
         '../testing/gtest.gyp:gtest',
+        '../third_party/webrtc/modules/modules.gyp:desktop_capture',
       ],
       'sources': [
         'audio/mock_audio_manager.cc',