Fix canPlayType() support for non-RFC compliant mp3 mimetype.

content/browser/media/media_canplaytype_browsertest.cc

Index: content/browser/media/media_canplaytype_browsertest.cc
diff --git a/content/browser/media/media_canplaytype_browsertest.cc b/content/browser/media/media_canplaytype_browsertest.cc
index 7897d78618b9b0aa22e72b9a0970de323aa62055..8f064df1f9f6a9fbd19da6892c3cd6b044f17446 100644
--- a/content/browser/media/media_canplaytype_browsertest.cc
+++ b/content/browser/media/media_canplaytype_browsertest.cc
@@ -345,9 +345,13 @@ IN_PROC_BROWSER_TEST_F(MediaCanPlayTypeTest, CodecSupportTest_mp3) {
   EXPECT_EQ(kNot, CanPlay("'video/mpeg'"));
   EXPECT_EQ(kNot, CanPlay("'video/x-mp3'"));
 
-  // audio/mpeg does not allow any codecs parameter
+  // audio/mpeg without a codecs parameter (RFC 3003 compliant)
   EXPECT_EQ(kPropProbably, CanPlay("'audio/mpeg'"));
 
+  // audio/mpeg with mp3 in codecs parameter. (Not RFC compliant, but
+  // very common in the wild so it is a defacto standard).
+  EXPECT_EQ(kPropProbably, CanPlay("'audio/mpeg; codecs=\"mp3\"'"));
+
   EXPECT_EQ(kNot, CanPlay("'audio/mpeg; codecs=\"avc1\"'"));
   EXPECT_EQ(kNot, CanPlay("'audio/mpeg; codecs=\"avc3\"'"));