Convert USE_PROPRIETARY_CODECS to a buildflag header.

content/browser/media/media_browsertest.cc

Index: content/browser/media/media_browsertest.cc
diff --git a/content/browser/media/media_browsertest.cc b/content/browser/media/media_browsertest.cc
index 1bfb71e792b3768d5963a7dcf70e8290f5acb13a..fb617e24c8baa9bb66801630cd154b85d462edd4 100644
--- a/content/browser/media/media_browsertest.cc
+++ b/content/browser/media/media_browsertest.cc
@@ -15,6 +15,7 @@
 #include "content/shell/browser/shell.h"
 #include "media/base/media_switches.h"
 #include "media/base/test_data_util.h"
+#include "media/media_features.h"
 #include "net/test/embedded_test_server/embedded_test_server.h"
 
 namespace content {
@@ -141,7 +142,7 @@ IN_PROC_BROWSER_TEST_P(MediaTest, VideoBear12DepthVP9) {
 }
 #endif
 
-#if defined(USE_PROPRIETARY_CODECS)
+#if BUILDFLAG(USE_PROPRIETARY_CODECS)
 // Crashes on Mac only.  http://crbug.com/621857
 #if defined(OS_MACOSX)
 #define MAYBE_VideoBearMp4 DISABLED_VideoBearMp4
@@ -199,10 +200,10 @@ IN_PROC_BROWSER_TEST_F(MediaTest, VideoBearRotated180) {
 IN_PROC_BROWSER_TEST_F(MediaTest, VideoBearRotated270) {
   RunVideoSizeTest("bear_rotate_270.mp4", 720, 1280);
 }
-#endif  // defined(USE_PROPRIETARY_CODECS)
+#endif  // BUILDFLAG(USE_PROPRIETARY_CODECS)
 
 #if defined(OS_CHROMEOS)
-#if defined(USE_PROPRIETARY_CODECS)
+#if BUILDFLAG(USE_PROPRIETARY_CODECS)
 IN_PROC_BROWSER_TEST_P(MediaTest, VideoBearAviMp3Mpeg4) {
   PlayVideo("bear_mpeg4_mp3.avi", GetParam());
 }
@@ -226,7 +227,7 @@ IN_PROC_BROWSER_TEST_P(MediaTest, VideoBear3gpAmrnbMpeg4) {
 IN_PROC_BROWSER_TEST_P(MediaTest, VideoBearWavGsmms) {
   PlayAudio("bear_gsm_ms.wav", GetParam());
 }
-#endif  // defined(USE_PROPRIETARY_CODECS)
+#endif  // BUILDFLAG(USE_PROPRIETARY_CODECS)
 #endif  // defined(OS_CHROMEOS)
 
 IN_PROC_BROWSER_TEST_P(MediaTest, AudioBearFlac) {