Replace OS_ANDROID define to disable webrtc test.

webrtc/modules/video_coding/codecs/test/videoprocessor_integrationtest.cc

Index: webrtc/modules/video_coding/codecs/test/videoprocessor_integrationtest.cc
diff --git a/webrtc/modules/video_coding/codecs/test/videoprocessor_integrationtest.cc b/webrtc/modules/video_coding/codecs/test/videoprocessor_integrationtest.cc
index b9c78d61925116f044dad3eaf70f39c3c75c6322..bdee84db6c2f0122b49d12b286a48248bdf7fd5b 100644
--- a/webrtc/modules/video_coding/codecs/test/videoprocessor_integrationtest.cc
+++ b/webrtc/modules/video_coding/codecs/test/videoprocessor_integrationtest.cc
@@ -708,7 +708,7 @@ TEST_F(VideoProcessorIntegrationTest, ProcessNoLossChangeBitRateVP9) {
 // Note: quality after update should be higher but we currently compute quality
 // metrics averaged over whole sequence run.
 
-#if defined(OS_ANDROID)
+#if defined(WEBRTC_ANDROID)
 // Flaky on Android: https://bugs.chromium.org/p/webrtc/issues/detail?id=6057.
 #define MAYBE_ProcessNoLossChangeFrameRateFrameDropVP9 \
   DISABLED_ProcessNoLossChangeFrameRateFrameDropVP9