Change EmeInitDataType to be an enum class

media/base/key_system_info.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/base/key_system_info.h"
 
 namespace media {
 
 KeySystemInfo::KeySystemInfo()
-    : supported_init_data_types(EME_INIT_DATA_TYPE_NONE),
+    : supported_init_data_types(kSupportedInitDataTypeNone),
       supported_codecs(EME_CODEC_NONE),
       persistent_license_support(EME_SESSION_TYPE_INVALID),
       persistent_release_message_support(EME_SESSION_TYPE_INVALID),
       persistent_state_support(EME_FEATURE_INVALID),
       distinctive_identifier_support(EME_FEATURE_INVALID),
       use_aes_decryptor(false) {
 }
 
 KeySystemInfo::~KeySystemInfo() {
 }
 
 }  // namespace media