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

webrtc/test/frame_generator.cc

Index: webrtc/test/frame_generator.cc
diff --git a/webrtc/test/frame_generator.cc b/webrtc/test/frame_generator.cc
index eeb0b0f9e5c1ed099f281f881b993f0e19a41bec..b6307f94c1c942fc3437f0a85171c75d9309a9b1 100644
--- a/webrtc/test/frame_generator.cc
+++ b/webrtc/test/frame_generator.cc
@@ -161,7 +161,7 @@ class ScrollingImageFrameGenerator : public FrameGenerator {
         current_source_frame_(nullptr),
         file_generator_(files, source_width, source_height, 1) {
     RTC_DCHECK(clock_ != nullptr);
-    RTC_DCHECK_GT(num_frames_, 0u);
+    RTC_DCHECK_GT(num_frames_, 0);
     RTC_DCHECK_GE(source_height, target_height);
     RTC_DCHECK_GE(source_width, target_width);
     RTC_DCHECK_GE(scroll_time_ms, 0);