DevTools: Add JSDoc for static methods, fix JSDoc types and induced errors

Source/devtools/front_end/InspectorFrontendAPI.js

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 173 matching lines @@
      * @param {!InspectorFrontendAPI.ForwardedKeyboardEvent} event
      */
     keyEventUnhandled: function(event)
     {
         InspectorFrontendAPI._runOnceLoaded(function() {
             WebInspector.forwardedEventHandler.keyEventReceived(event.type, event.keyIdentifier, event.keyCode, event.modifiers);
         });
     },
 
     /**
-     * @param {!string} eventType
+     * @param {string} eventType
      * @param {*=} eventData
      * @return {boolean}
      */
     dispatchEventToListeners: function(eventType, eventData)
     {
         return WebInspector.inspectorFrontendEventSink.dispatchEventToListeners(eventType, eventData);
     },
 
     /**
      * @param {string} url
@@ skipping 52 matching lines @@
         if (InspectorFrontendAPI._isLoaded) {
             command();
             return;
         }
         InspectorFrontendAPI._pendingCommands.push(command);
     }
 }
 
 /** @typedef {!Object.<{type: string, keyCode: (number|undefined), keyIdentifier: (string|undefined), modifiers: (number|undefined)}>} */
 InspectorFrontendAPI.ForwardedKeyboardEvent;