Stop using the MEDIASTREAM content setting.

components/content_settings/core/common/pref_names.cc

Index: components/content_settings/core/common/pref_names.cc
diff --git a/components/content_settings/core/common/pref_names.cc b/components/content_settings/core/common/pref_names.cc
index ef9b66cb12f7458568c84fa0bbfb4a25cdc8c932..5e1e8709c4eb35e7a319953cbed666afe6ca2a6f 100644
--- a/components/content_settings/core/common/pref_names.cc
+++ b/components/content_settings/core/common/pref_names.cc
@@ -28,6 +28,11 @@ const char kDefaultContentSettings[] = "profile.default_content_settings";
 // If a value is not set, it means the setting is allowed.
 const char kOverrideContentSettings[] = "profile.override_content_settings";
 
+// Boolean indicating whether the media stream default setting had been
+// migrated into two separate microphone and camera settings.
+const char kMigratedDefaultMediaStreamSetting[] =
+    "profile.migrated_default_content_settings.media_stream";
+
 // Preferences that are exclusively used to store managed values for default
 // content settings.
 const char kManagedDefaultCookiesSetting[] =