Revert event add checks that method not fires two times at the time

Author: Nazar65

lib/web/mage/adminhtml/wysiwyg/tiny_mce/tinymce4Adapter.js

@@ -293,6 +293,7 @@ define([
                     };
 
                     varienGlobalEvents.fireEvent('open_browser_callback', payload);
+                    this.eventBus.fireEvent('open_browser_callback', payload);
                 }.bind(this);
             }
 
@@ -372,7 +373,7 @@ define([
         /**
          * @param {Object} o
          */
-        openFileBrowser: function (o) {
+        openFileBrowser: _.debounce(function (o) {
             var typeTitle = this.translate('Select Images'),
                 storeId = this.config['store_id'] ? this.config['store_id'] : 0,
                 frameDialog = jQuery('div.mce-container[role="dialog"]'),
@@ -405,7 +406,7 @@ define([
                     }
                 );
             });
-        },
+        }, 250),
 
         /**
          * @param {String} string