Use webrtc::DesktopCapturer for screen capturer implementation.

media/video/capture/screen/screen_capturer_mock_objects.cc

Index: media/video/capture/screen/screen_capturer_mock_objects.cc
diff --git a/media/video/capture/screen/screen_capturer_mock_objects.cc b/media/video/capture/screen/screen_capturer_mock_objects.cc
index e4fa7fb7f802f0584d26360a0c2fc696586f6f31..923a214c7e8db4ecceadcb05bf6f840f6325fa1f 100644
--- a/media/video/capture/screen/screen_capturer_mock_objects.cc
+++ b/media/video/capture/screen/screen_capturer_mock_objects.cc
@@ -6,6 +6,7 @@
 
 #include "media/video/capture/screen/screen_capturer.h"
 #include "testing/gmock/include/gmock/gmock.h"
+#include "third_party/webrtc/modules/desktop_capture/desktop_region.h"
 
 namespace media {
 
@@ -15,16 +16,10 @@ MockScreenCapturer::MockScreenCapturer() {
 MockScreenCapturer::~MockScreenCapturer() {
 }
 
-MockScreenCapturerDelegate::MockScreenCapturerDelegate() {
+MockScreenCapturerCallback::MockScreenCapturerCallback() {
 }
 
-MockScreenCapturerDelegate::~MockScreenCapturerDelegate() {
-}
-
-void MockScreenCapturerDelegate::OnCursorShapeChanged(
-    scoped_ptr<MouseCursorShape> cursor_shape) {
-  // Notify the mock method.
-  OnCursorShapeChangedPtr(cursor_shape.get());
+MockScreenCapturerCallback::~MockScreenCapturerCallback() {
 }
 
 }  // namespace media