Add options for audio/video autoplay to chrome://settings/content.

chrome/browser/content_settings/tab_specific_content_settings.cc

Index: chrome/browser/content_settings/tab_specific_content_settings.cc
diff --git a/chrome/browser/content_settings/tab_specific_content_settings.cc b/chrome/browser/content_settings/tab_specific_content_settings.cc
index f8dff5a72b2bf5634d13fa43bae925dc5144cbcd..970b2435f9936f21324294f5ba3d0d10dc1b0a50 100644
--- a/chrome/browser/content_settings/tab_specific_content_settings.cc
+++ b/chrome/browser/content_settings/tab_specific_content_settings.cc
@@ -253,7 +253,8 @@ bool TabSpecificContentSettings::IsContentBlocked(
       content_type == CONTENT_SETTINGS_TYPE_MEDIASTREAM_CAMERA ||
       content_type == CONTENT_SETTINGS_TYPE_PPAPI_BROKER ||
       content_type == CONTENT_SETTINGS_TYPE_AUTOMATIC_DOWNLOADS ||
-      content_type == CONTENT_SETTINGS_TYPE_MIDI_SYSEX) {
+      content_type == CONTENT_SETTINGS_TYPE_MIDI_SYSEX ||
+      content_type == CONTENT_SETTINGS_TYPE_MEDIA_AUTOPLAY) {
     const auto& it = content_settings_status_.find(content_type);
     if (it != content_settings_status_.end())
       return it->second.blocked;