RTC_[D]CHECK_op: Remove superfluous casts

webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc

Index: webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc
diff --git a/webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc b/webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc
index 97f745b50b82317cd149badd195cd188cf41cd83..bfb5606e2cb2a9d23af252c1446ed199060a2fa2 100644
--- a/webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc
+++ b/webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc
@@ -497,8 +497,8 @@ int VP9EncoderImpl::Encode(const VideoFrame& input_image,
   if (frame_types && frame_types->size() > 0) {
     frame_type = (*frame_types)[0];
   }
-  RTC_DCHECK_EQ(input_image.width(), static_cast<int>(raw_->d_w));
-  RTC_DCHECK_EQ(input_image.height(), static_cast<int>(raw_->d_h));
+  RTC_DCHECK_EQ(input_image.width(), raw_->d_w);
+  RTC_DCHECK_EQ(input_image.height(), raw_->d_h);
 
   // Set input image for use in the callback.
   // This was necessary since you need some information from input_image.