Remove DesktopRegion parameter in DesktopCapturer::Capture.

webrtc/modules/desktop_capture/screen_capturer_mock_objects.h

Index: webrtc/modules/desktop_capture/screen_capturer_mock_objects.h
diff --git a/webrtc/modules/desktop_capture/screen_capturer_mock_objects.h b/webrtc/modules/desktop_capture/screen_capturer_mock_objects.h
index f08dab5318a39e515e4040c0b2147afbced6551a..6baaa472bfe73cc22c0c1352005736969e7c7298 100644
--- a/webrtc/modules/desktop_capture/screen_capturer_mock_objects.h
+++ b/webrtc/modules/desktop_capture/screen_capturer_mock_objects.h
@@ -19,11 +19,16 @@ namespace webrtc {
 
 class MockScreenCapturer : public ScreenCapturer {
  public:
-  MockScreenCapturer() {}
+  MockScreenCapturer() {
+    ON_CALL(*this, Capture(testing::_))
+        .WillByDefault(testing::WithoutArgs(testing::Invoke(
+            this, &MockScreenCapturer::CaptureFrame)));
+  }
   virtual ~MockScreenCapturer() {}
 
   MOCK_METHOD1(Start, void(Callback* callback));
   MOCK_METHOD1(Capture, void(const DesktopRegion& region));
+  MOCK_METHOD0(CaptureFrame, void(void));
   MOCK_METHOD1(GetScreenList, bool(ScreenList* screens));
   MOCK_METHOD1(SelectScreen, bool(ScreenId id));