add "always allow" option to the mediastream infobar and allow user to allow/not allow acces to devi

chrome/browser/resources/options2/content_settings_exceptions_area.js

Index: chrome/browser/resources/options2/content_settings_exceptions_area.js
diff --git a/chrome/browser/resources/options2/content_settings_exceptions_area.js b/chrome/browser/resources/options2/content_settings_exceptions_area.js
index ef4fa6bbd4b818de2408f6e2bf152dbfa9f77471..243ac4b85fe719a4091eebc695e10626440e8916 100644
--- a/chrome/browser/resources/options2/content_settings_exceptions_area.js
+++ b/chrome/browser/resources/options2/content_settings_exceptions_area.js
@@ -111,9 +111,10 @@ cr.define('options.contentSettings', function() {
 
       this.updateEditables();
 
-      // Editing notifications and geolocation is disabled for now.
+      // Editing notifications, geolocation and mediastream is disabled for now.
       if (this.contentType == 'notifications' ||
-          this.contentType == 'location') {
+          this.contentType == 'location' ||
+          this.contentType == 'mediastream') {
         this.editable = false;
       }
 
@@ -441,10 +442,11 @@ cr.define('options.contentSettings', function() {
      * Returns whether the rows are editable in this list.
      */
     isEditable: function() {
-      // Editing notifications and geolocation is disabled for now.
+      // Editing notifications, geolocation and mediastream is disabled for now.
       return !(this.contentType == 'notifications' ||
                this.contentType == 'location' ||
-               this.contentType == 'fullscreen');
+               this.contentType == 'fullscreen' ||
+               this.contentType == 'mediastream');
     },
 
     /**