Convert USE_PROPRIETARY_CODECS to a buildflag header.

chrome/browser/media/encrypted_media_browsertest.cc

Index: chrome/browser/media/encrypted_media_browsertest.cc
diff --git a/chrome/browser/media/encrypted_media_browsertest.cc b/chrome/browser/media/encrypted_media_browsertest.cc
index d3ece5603c5aad24ebe88bec7d28226f80a08e8c..5a63645e922b7ddb71e656fbef280b4236e6ebbf 100644
--- a/chrome/browser/media/encrypted_media_browsertest.cc
+++ b/chrome/browser/media/encrypted_media_browsertest.cc
@@ -20,6 +20,7 @@
 #include "content/public/common/content_switches.h"
 #include "content/public/test/browser_test_utils.h"
 #include "media/base/media_switches.h"
+#include "media/media_features.h"
 #include "ppapi/features/features.h"
 #include "testing/gtest/include/gtest/gtest-spi.h"
 
@@ -64,12 +65,12 @@ const char kWebMVP8VideoOnly[] = "video/webm; codecs=\"vp8\"";
 const char kWebMVorbisAudioVP8Video[] = "video/webm; codecs=\"vorbis, vp8\"";
 const char kWebMOpusAudioVP9Video[] = "video/webm; codecs=\"opus, vp9\"";
 const char kWebMVP9VideoOnly[] = "video/webm; codecs=\"vp9\"";
-#if defined(USE_PROPRIETARY_CODECS)
+#if BUILDFLAG(USE_PROPRIETARY_CODECS)
 const char kMP4AudioOnly[] = "audio/mp4; codecs=\"mp4a.40.2\"";
 const char kMP4VideoOnly[] = "video/mp4; codecs=\"avc1.4D000C\"";
 const char kMP4VideoVp9Only[] =
     "video/mp4; codecs=\"vp09.00.01.08.02.01.01.00\"";
-#endif  // defined(USE_PROPRIETARY_CODECS)
+#endif  // BUILDFLAG(USE_PROPRIETARY_CODECS)
 
 // Sessions to load.
 const char kNoSessionToLoad[] = "";
@@ -528,7 +529,7 @@ IN_PROC_BROWSER_TEST_P(EncryptedMediaTest, FrameSizeChangeVideo) {
   TestFrameSizeChange();
 }
 
-#if defined(USE_PROPRIETARY_CODECS)
+#if BUILDFLAG(USE_PROPRIETARY_CODECS)
 // Crashes on Mac only.  http://crbug.com/621857
 #if defined(OS_MACOSX)
 #define MAYBE_Playback_VideoOnly_MP4 DISABLED_Playback_VideoOnly_MP4
@@ -606,7 +607,7 @@ IN_PROC_BROWSER_TEST_P(EncryptedMediaTest,
   TestDifferentContainers(EncryptedContainer::ENCRYPTED_WEBM,
                           EncryptedContainer::ENCRYPTED_MP4);
 }
-#endif  // defined(USE_PROPRIETARY_CODECS)
+#endif  // BUILDFLAG(USE_PROPRIETARY_CODECS)
 
 #if defined(WIDEVINE_CDM_AVAILABLE)
 // The parent key system cannot be used when creating MediaKeys.