Remove DesktopRegion parameter in DesktopCapturer::Capture.

webrtc/modules/desktop_capture/screen_capturer_mac.mm

Index: webrtc/modules/desktop_capture/screen_capturer_mac.mm
diff --git a/webrtc/modules/desktop_capture/screen_capturer_mac.mm b/webrtc/modules/desktop_capture/screen_capturer_mac.mm
index 451cd9ed9d8168463d6370ef52b0a012ebfaefaa..5bb507f0d740ba12192ce2f0b3003fcb42304a37 100644
--- a/webrtc/modules/desktop_capture/screen_capturer_mac.mm
+++ b/webrtc/modules/desktop_capture/screen_capturer_mac.mm
@@ -196,7 +196,7 @@ class ScreenCapturerMac : public ScreenCapturer {
 
   // Overridden from ScreenCapturer:
   void Start(Callback* callback) override;
-  void Capture(const DesktopRegion& region) override;
+  void CaptureFrame() override;
   void SetExcludedWindow(WindowId window) override;
   bool GetScreenList(ScreenList* screens) override;
   bool SelectScreen(ScreenId id) override;
@@ -340,7 +340,7 @@ void ScreenCapturerMac::Start(Callback* callback) {
   callback_ = callback;
 }
 
-void ScreenCapturerMac::Capture(const DesktopRegion& region_to_capture) {
+void ScreenCapturerMac::CaptureFrame() {
   int64_t capture_start_time_nanos = rtc::TimeNanos();
 
   queue_.MoveToNextFrame();