Remove DesktopRegion parameter in DesktopCapturer::Capture.

webrtc/modules/desktop_capture/window_capturer_x11.cc

Index: webrtc/modules/desktop_capture/window_capturer_x11.cc
diff --git a/webrtc/modules/desktop_capture/window_capturer_x11.cc b/webrtc/modules/desktop_capture/window_capturer_x11.cc
index d88585bfa8052d34a0de60b58a8089d6a3992bca..e4a0917b9063dfd89a87eb906660d7d83040e409 100644
--- a/webrtc/modules/desktop_capture/window_capturer_x11.cc
+++ b/webrtc/modules/desktop_capture/window_capturer_x11.cc
@@ -95,7 +95,7 @@ class WindowCapturerLinux : public WindowCapturer,
 
   // DesktopCapturer interface.
   void Start(Callback* callback) override;
-  void Capture(const DesktopRegion& region) override;
+  void CaptureFrame() override;
 
   // SharedXDisplay::XEventHandler interface.
   bool HandleXEvent(const XEvent& event) override;
@@ -271,7 +271,7 @@ void WindowCapturerLinux::Start(Callback* callback) {
   callback_ = callback;
 }
 
-void WindowCapturerLinux::Capture(const DesktopRegion& region) {
+void WindowCapturerLinux::CaptureFrame() {
   if (!x_server_pixel_buffer_.IsWindowValid()) {
     LOG(LS_INFO) << "The window is no longer valid.";
     callback_->OnCaptureResult(Result::ERROR_PERMANENT, nullptr);