Remove DISABLED_ON_ macros.

webrtc/modules/video_processing/test/brightness_detection_test.cc

Index: webrtc/modules/video_processing/test/brightness_detection_test.cc
diff --git a/webrtc/modules/video_processing/test/brightness_detection_test.cc b/webrtc/modules/video_processing/test/brightness_detection_test.cc
index 041a6e090f52a40a9982d0f0c7d4fd3324fe1117..014c39468d051403a1710c7bca9c227a85744c64 100644
--- a/webrtc/modules/video_processing/test/brightness_detection_test.cc
+++ b/webrtc/modules/video_processing/test/brightness_detection_test.cc
@@ -11,11 +11,14 @@
 #include "webrtc/common_video/libyuv/include/webrtc_libyuv.h"
 #include "webrtc/modules/video_processing/include/video_processing.h"
 #include "webrtc/modules/video_processing/test/video_processing_unittest.h"
-#include "webrtc/test/testsupport/gtest_disable.h"
 
 namespace webrtc {
 
-TEST_F(VideoProcessingTest, DISABLED_ON_IOS(BrightnessDetection)) {
+#if defined(WEBRTC_IOS)
+TEST_F(VideoProcessingTest, DISABLED_BrightnessDetection) {
+#else
+TEST_F(VideoProcessingTest, BrightnessDetection) {
+#endif
   uint32_t frameNum = 0;
   int32_t brightnessWarning = 0;
   uint32_t warningCount = 0;