RTC_[D]CHECK_op: Remove "u" suffix on integer constants

There's no longer any need to make the two arguments have the same
signedness, so we can drop the "u" suffix on literal integer
arguments.

NOPRESUBMIT=true
BUG=webrtc:6645

Review-Url: https://codereview.webrtc.org/2535593002
Cr-Commit-Position: refs/heads/master@{#15280}
diff --git a/webrtc/modules/video_coding/video_codec_initializer.cc b/webrtc/modules/video_coding/video_codec_initializer.cc
index 57f9b26..c6db916 100644
--- a/webrtc/modules/video_coding/video_codec_initializer.cc
+++ b/webrtc/modules/video_coding/video_codec_initializer.cc
@@ -177,8 +177,8 @@
   }
   for (size_t i = 0; i < streams.size(); ++i) {
     SimulcastStream* sim_stream = &video_codec.simulcastStream[i];
-    RTC_DCHECK_GT(streams[i].width, 0u);
-    RTC_DCHECK_GT(streams[i].height, 0u);
+    RTC_DCHECK_GT(streams[i].width, 0);
+    RTC_DCHECK_GT(streams[i].height, 0);
     RTC_DCHECK_GT(streams[i].max_framerate, 0);
     // Different framerates not supported per stream at the moment.
     RTC_DCHECK_EQ(streams[i].max_framerate, streams[0].max_framerate);