Use webrtc/base/checks.h in desktop_capture.

Collided with CHECKs included in logging headers.

BUG=webrtc:5118
R=mflodman@webrtc.org

Review URL: https://codereview.webrtc.org/1418423003

Cr-Commit-Position: refs/heads/master@{#10425}

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.