DevTools: Only provide static script content to UISourceCode

third_party/WebKit/Source/devtools/front_end/common/StaticContentProvider.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 /**
  * @implements {Common.ContentProvider}
  * @unrestricted
  */
 Common.StaticContentProvider = class {
   /**
    * @param {string} contentURL
@@ skipping 31 matching lines @@
    */
   contentType() {
     return this._contentType;
   }
 
   /**
    * @override
    * @return {!Promise<?string>}
    */
   requestContent() {
-    return /** @type {!Promise<?string>} */ (this._lazyContent());
+    return this._lazyContent();
   }
 
   /**
    * @override
    * @param {string} query
    * @param {boolean} caseSensitive
    * @param {boolean} isRegex
    * @param {function(!Array.<!Common.ContentProvider.SearchMatch>)} callback
    */
   searchInContent(query, caseSensitive, isRegex, callback) {
     /**
      * @param {?string} content
      */
     function performSearch(content) {
       if (!content) {
         callback(/** @type {!Array<!Common.ContentProvider.SearchMatch>} */ ([]));
         return;
       }
       callback(Common.ContentProvider.performSearchInContent(content, query, caseSensitive, isRegex));
     }
 
     this._lazyContent().then(performSearch);
   }
 };