Fix unused variable warning.

content/browser/media/media_source_browsertest.cc

Index: content/browser/media/media_source_browsertest.cc
diff --git a/content/browser/media/media_source_browsertest.cc b/content/browser/media/media_source_browsertest.cc
index 7c59bc021318848b3d6726d0a01a8b7a11e7a59e..3b8a73edbb1e9d500afed5737c2f06f8ef8f4ec4 100644
--- a/content/browser/media/media_source_browsertest.cc
+++ b/content/browser/media/media_source_browsertest.cc
@@ -12,7 +12,8 @@
 // Common media types.
 const char kWebMAudioOnly[] = "audio/webm; codecs=\"vorbis\"";
 #if !defined(OS_ANDROID)
-const char kWebMOpusAudioOnly[] = "audio/webm; codecs=\"opus\"";
+// TODO(dalecurtis): Disabled while the test data file is updated.
+// const char kWebMOpusAudioOnly[] = "audio/webm; codecs=\"opus\"";
 #endif
 const char kWebMVideoOnly[] = "video/webm; codecs=\"vp8\"";
 const char kWebMAudioVideo[] = "video/webm; codecs=\"vorbis, vp8\"";