Clean up a few more unused globals.

chrome/renderer/media/chrome_key_systems.cc

Index: chrome/renderer/media/chrome_key_systems.cc
diff --git a/chrome/renderer/media/chrome_key_systems.cc b/chrome/renderer/media/chrome_key_systems.cc
index 173fd046d55aca2d33b57a5d5cc9d24f43dcbe3a..c12a3ed6621c4f3176464af17dc8b145680416c8 100644
--- a/chrome/renderer/media/chrome_key_systems.cc
+++ b/chrome/renderer/media/chrome_key_systems.cc
@@ -25,16 +25,18 @@
 
 using content::KeySystemInfo;
 
-static const char kAudioWebM[] = "audio/webm";
-static const char kVideoWebM[] = "video/webm";
-static const char kVorbis[] = "vorbis";
-static const char kVorbisVP8[] = "vorbis,vp8,vp8.0";
-
-static const char kAudioMp4[] = "audio/mp4";
-static const char kVideoMp4[] = "video/mp4";
-static const char kMp4a[] = "mp4a";
-static const char kAvc1[] = "avc1";
-static const char kMp4aAvc1[] = "mp4a,avc1";
+const char kAudioWebM[] = "audio/webm";
+const char kVideoWebM[] = "video/webm";
+const char kVorbis[] = "vorbis";
+const char kVorbisVP8[] = "vorbis,vp8,vp8.0";
+
+#if defined(USE_PROPRIETARY_CODECS)
+const char kAudioMp4[] = "audio/mp4";
+const char kVideoMp4[] = "video/mp4";
+const char kMp4a[] = "mp4a";
+const char kAvc1[] = "avc1";
+const char kMp4aAvc1[] = "mp4a,avc1";
+#endif  // defined(USE_PROPRIETARY_CODECS)
 
 #if defined(ENABLE_PEPPER_CDMS)
 static bool IsPepperCdmRegistered(const std::string& pepper_type) {