Don't update Media.EME.KeySystemSupport UMA for unprefixed EME

media/base/key_systems.h

Index: media/base/key_systems.h
diff --git a/media/base/key_systems.h b/media/base/key_systems.h
index 4eea0421a58d3915f46054639a35a4b70f06695e..6069a763aa90cb886d3c6e321a15ffdc77d92028 100644
--- a/media/base/key_systems.h
+++ b/media/base/key_systems.h
@@ -52,11 +52,13 @@ MEDIA_EXPORT bool IsSupportedKeySystemWithInitDataType(
 // systems.
 MEDIA_EXPORT bool IsConcreteSupportedKeySystem(const std::string& key_system);
 
-// Returns whether |key_sytem| supports the specified media type and codec(s).
+// Returns whether |key_system| supports the specified media type and codec(s).
+// |reportToUma| should only be true for prefixed calls.
 MEDIA_EXPORT bool IsSupportedKeySystemWithMediaMimeType(
     const std::string& mime_type,
     const std::vector<std::string>& codecs,
-    const std::string& key_system);
+    const std::string& key_system,
+    bool reportToUma);
 
 // Returns a name for |key_system| suitable to UMA logging.
 MEDIA_EXPORT std::string GetKeySystemNameForUMA(const std::string& key_system);