Use webrtc/base/checks.h in desktop_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 75655762e9bc6c032d46f1e9a258f56762b47772..e34beda7b75588e18a41bdd1c54369dec0363383 100644
--- a/webrtc/modules/desktop_capture/screen_capturer_x11.cc
+++ b/webrtc/modules/desktop_capture/screen_capturer_x11.cc
@@ -18,6 +18,7 @@
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
 
+#include "webrtc/base/checks.h"
 #include "webrtc/base/scoped_ptr.h"
 #include "webrtc/modules/desktop_capture/desktop_capture_options.h"
 #include "webrtc/modules/desktop_capture/desktop_frame.h"
@@ -28,18 +29,7 @@
 #include "webrtc/system_wrappers/interface/logging.h"
 #include "webrtc/system_wrappers/interface/tick_util.h"
 
-// TODO(sergeyu): Move this to a header where it can be shared.
-#if defined(NDEBUG)
-#define RTC_DCHECK(condition) (void)(condition)
-#else  // NDEBUG
-#define RTC_DCHECK(condition) \
-  if (!(condition)) {         \
-    abort();                  \
-  }
-#endif
-
 namespace webrtc {
-
 namespace {
 
 // A class to perform video frame capturing for Linux.