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

Source/devtools/front_end/sdk/OverridesSupport.js

 /*
  * Copyright (C) 2012 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 242 matching lines @@
     return new WebInspector.OverridesSupport.DeviceOrientation(alpha, beta, gamma);
 }
 
 WebInspector.OverridesSupport.DeviceOrientation.clearDeviceOrientationOverride = function()
 {
     PageAgent.clearDeviceOrientationOverride();
 }
 
 /**
  * @param {string} value
- * @return {!string}
+ * @return {string}
  */
 WebInspector.OverridesSupport.integerInputValidator = function(value)
 {
     if (/^[\d]+$/.test(value) && value >= 0 && value <= 10000)
         return "";
     return WebInspector.UIString("Value must be non-negative integer");
 }
 
 /**
  * @param {string} value
- * @return {!string}
+ * @return {string}
  */
 WebInspector.OverridesSupport.doubleInputValidator = function(value)
 {
     if (/^[\d]+(\.\d+)?|\.\d+$/.test(value) && value >= 0 && value <= 10000)
         return "";
     return WebInspector.UIString("Value must be non-negative float");
 }
 
 /**
  * @param {string} value
- * @return {!string}
+ * @return {string}
  */
 WebInspector.OverridesSupport.networkDomainsValidator = function(value)
 {
     function test(s)
     {
         return /^[\w\-]+(\.[\w\-]+)*$/.test(s.trim());
     }
 
     if (!value.trim())
         return "";
@@ skipping 933 matching lines @@
     },
 
     __proto__: WebInspector.Object.prototype
 }
 
 
 /**
  * @type {!WebInspector.OverridesSupport}
  */
 WebInspector.overridesSupport;