Remove remaining uses of KeySystemInfo and InitDataTypeMask

media/base/eme_constants.h

Index: media/base/eme_constants.h
diff --git a/media/base/eme_constants.h b/media/base/eme_constants.h
index 22fbeba488c168f690614ecf72dc118e70cdf575..26fedb0a62ab54d79049eb8d2ba478f353106453 100644
--- a/media/base/eme_constants.h
+++ b/media/base/eme_constants.h
@@ -12,7 +12,6 @@ namespace media {
 // Defines values that specify registered Initialization Data Types used
 // in Encrypted Media Extensions (EME).
 // http://w3c.github.io/encrypted-media/initdata-format-registry.html#registry
-// The mask values are stored in a InitDataTypeMask.
 enum class EmeInitDataType {
   UNKNOWN,
   WEBM,
@@ -20,12 +19,6 @@ enum class EmeInitDataType {
   KEYIDS
 };
 
-typedef uint32_t InitDataTypeMask;
-const InitDataTypeMask kInitDataTypeMaskNone = 0;
-const InitDataTypeMask kInitDataTypeMaskWebM = 1 << 0;
-const InitDataTypeMask kInitDataTypeMaskCenc = 1 << 1;
-const InitDataTypeMask kInitDataTypeMaskKeyIds = 1 << 2;
-
 // Defines bitmask values that specify codecs used in Encrypted Media Extension
 // (EME). Each value represents a codec within a specific container.
 // The mask values are stored in a SupportedCodecs.