Fix build error introduced by r8864.

BUG=4323
TBR=pbos@webrtc.org
R=pbos@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/43969004

Cr-Commit-Position: refs/heads/master@{#8865}
diff --git a/webrtc/video_engine/test/auto_test/source/vie_autotest_codec.cc b/webrtc/video_engine/test/auto_test/source/vie_autotest_codec.cc
index 4538206..f5ff771 100644
--- a/webrtc/video_engine/test/auto_test/source/vie_autotest_codec.cc
+++ b/webrtc/video_engine/test/auto_test/source/vie_autotest_codec.cc
@@ -516,7 +516,7 @@
   EXPECT_EQ(0, codec->GetSendCodec(video_channel, video_codec));
   // We don't allow allocated start bitrate to be decreased via SetSendCodec,
   // and the default bitrate available in the allocator is 300.
-  EXPECT_EQ(300, video_codec.startBitrate);
+  EXPECT_EQ(300u, video_codec.startBitrate);
 
   memset(&video_codec, 0, sizeof(video_codec));
   EXPECT_EQ(0, codec->GetSendCodec(video_channel, video_codec));