Replace some asserts with DCHECKs

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 da58e647a45c77a9cb826e678c583361fbc71ea8..a6f4f91838ea7bacef11024fafeec373ade03e82 100644
--- a/webrtc/modules/desktop_capture/screen_capturer_x11.cc
+++ b/webrtc/modules/desktop_capture/screen_capturer_x11.cc
@@ -292,7 +292,7 @@ bool ScreenCapturerLinux::HandleXEvent(const XEvent& event) {
 
 std::unique_ptr<DesktopFrame> ScreenCapturerLinux::CaptureScreen() {
   std::unique_ptr<SharedDesktopFrame> frame = queue_.current_frame()->Share();
-  assert(x_server_pixel_buffer_.window_size().equals(frame->size()));
+  RTC_DCHECK(x_server_pixel_buffer_.window_size().equals(frame->size()));
 
   // Pass the screen size to the helper, so it can clip the invalid region if it
   // expands that region to a grid.