Enable unprefixed EME in WebView.

BUG=394931

Review URL: https://codereview.chromium.org/1130253007

Cr-Commit-Position: refs/heads/master@{#330041}

android_webview/lib/main/aw_main_delegate.cc

@@ -77,9 +77,6 @@ bool AwMainDelegate::BasicStartupComplete(int* exit_code) {
   // Web Notification API and the Push API are not supported (crbug.com/434712)
   cl->AppendSwitch(switches::kDisableNotifications);
 
-  // TODO(ddorwin): Enable unprefixed EME. See http://crbug.com/394931.
-  cl->AppendSwitch(switches::kDisableEncryptedMedia);
-
   // WebRTC hardware decoding is not supported, internal bug 15075307
   cl->AppendSwitch(switches::kDisableWebRtcHWDecoding);
   cl->AppendSwitch(switches::kDisableAcceleratedVideoDecode);