Enable VP9 in MP4 by default

media/base/mime_util_internal.cc

Index: media/base/mime_util_internal.cc
diff --git a/media/base/mime_util_internal.cc b/media/base/mime_util_internal.cc
index 6ed4047ab9a496a24405b4d4951db833c188bf1e..b486fd9a6139f470621e9d41cf61a8d873260292 100644
--- a/media/base/mime_util_internal.cc
+++ b/media/base/mime_util_internal.cc
@@ -89,12 +89,9 @@ static bool ParseVp9CodecID(const std::string& mime_type_lower_case,
                             uint8_t* out_level,
                             VideoColorSpace* out_color_space) {
   if (mime_type_lower_case == "video/mp4") {
-    if (base::CommandLine::ForCurrentProcess()->HasSwitch(
-            switches::kEnableVp9InMp4)) {
-      // Only new style is allowed for mp4.
-      return ParseNewStyleVp9CodecID(codec_id, out_profile, out_level,
-                                     out_color_space);
-    }
+    // Only new style is allowed for mp4.
+    return ParseNewStyleVp9CodecID(codec_id, out_profile, out_level,
+                                   out_color_space);
   } else if (mime_type_lower_case == "video/webm") {
     if (HasNewVp9CodecStringSupport() &&
         ParseNewStyleVp9CodecID(codec_id, out_profile, out_level,