DevTools: fix sourceMapURL for inline stylesheets

third_party/WebKit/Source/devtools/front_end/sdk/CSSStyleSheetHeader.js

 // Copyright 2016 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.
 
 /**
  * @constructor
  * @implements {WebInspector.ContentProvider}
  * @param {!WebInspector.CSSModel} cssModel
  * @param {!CSSAgent.CSSStyleSheetHeader} payload
  */
@@ skipping 26 matching lines @@
             this._originalContentProvider = new WebInspector.StaticContentProvider(this.contentURL(), this.contentType(), lazyContent);
         }
         return this._originalContentProvider;
     },
 
     /**
      * @param {string=} sourceMapURL
      */
     setSourceMapURL: function(sourceMapURL)
     {
-        var completeSourceMapURL = this.sourceURL && sourceMapURL ? WebInspector.ParsedURL.completeURL(this.sourceURL, sourceMapURL) : null;
+        var completeSourceMapURL = this.sourceURL && sourceMapURL ? WebInspector.ParsedURL.completeURL(this.sourceURL, sourceMapURL) : sourceMapURL;
         this.sourceMapURL = completeSourceMapURL;
     },
 
     /**
      * @return {!WebInspector.Target}
      */
     target: function()
     {
         return this._cssModel.target();
     },
@@ skipping 155 matching lines @@
          */
         function performSearch(content)
         {
             var searchResults = content ? WebInspector.ContentProvider.performSearchInContent(content, query, caseSensitive, isRegex) : [];
             callback(searchResults);
         }
 
         this.requestContent().then(performSearch);
     }
 }