Remove DesktopRegion parameter in DesktopCapturer::Capture.

webrtc/modules/desktop_capture/screen_capturer_x11.cc

Index: webrtc/modules/desktop_capture/screen_capturer_x11.cc
diff --git a/webrtc/modules/desktop_capture/screen_capturer_x11.cc b/webrtc/modules/desktop_capture/screen_capturer_x11.cc
index 6f5e520e6e212220a31aa238ce5996321601d406..ff3ee1197f2c694e91eb522230325e5adcff6825 100644
--- a/webrtc/modules/desktop_capture/screen_capturer_x11.cc
+++ b/webrtc/modules/desktop_capture/screen_capturer_x11.cc
@@ -54,7 +54,7 @@ class ScreenCapturerLinux : public ScreenCapturer,
 
   // DesktopCapturer interface.
   void Start(Callback* delegate) override;
-  void Capture(const DesktopRegion& region) override;
+  void CaptureFrame() override;
 
   // ScreenCapturer interface.
   bool GetScreenList(ScreenList* screens) override;
@@ -228,7 +228,7 @@ void ScreenCapturerLinux::Start(Callback* callback) {
   callback_ = callback;
 }
 
-void ScreenCapturerLinux::Capture(const DesktopRegion& region) {
+void ScreenCapturerLinux::CaptureFrame() {
   int64_t capture_start_time_nanos = rtc::TimeNanos();
 
   queue_.MoveToNextFrame();