talk: Use NDEBUG macro.

talk/media/base/videorenderer.h

 /*
  * libjingle
  * Copyright 2004 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 10 matching lines @@
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef TALK_MEDIA_BASE_VIDEORENDERER_H_
 #define TALK_MEDIA_BASE_VIDEORENDERER_H_
 
-#ifdef _DEBUG
+#if !defined(NDEBUG)
 #include <string>
-#endif  // _DEBUG
+#endif
 
 #include "webrtc/base/sigslot.h"
 
 namespace cricket {
 
 class VideoFrame;
 
 // Abstract interface for rendering VideoFrames.
 class VideoRenderer {
  public:
   virtual ~VideoRenderer() {}
   // Called when the video has changed size. This is also used as an
   // initialization method to set the UI size before any video frame
   // rendered. webrtc::ExternalRenderer's FrameSizeChange will invoke this when
   // it's called or later when a VideoRenderer is attached.
   virtual bool SetSize(int width, int height, int reserved) = 0;
   // Called when a new frame is available for display.
   virtual bool RenderFrame(const VideoFrame *frame) = 0;
 
-#ifdef _DEBUG
+#if !defined(NDEBUG)
   // Allow renderer dumping out rendered frames.
   virtual bool SetDumpPath(const std::string &path) { return true; }
-#endif  // _DEBUG
+#endif
 };
 
 }  // namespace cricket
 
 #endif  // TALK_MEDIA_BASE_VIDEORENDERER_H_