DevTools: replace content provider when re-adding into network project

third_party/WebKit/Source/devtools/front_end/bindings/SASSSourceMapping.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 141 matching lines @@
                 this._sourceMapByURL[completeSourceMapURL] = sourceMap;
             else
                 delete this._sourceMapByURL[completeSourceMapURL];
 
             // Then report sources.
             var sources = sourceMap ? sourceMap.sources() : [];
             for (var i = 0; i < sources.length; ++i) {
                 var sassURL = sources[i];
                 if (!this._networkMapping.hasMappingForURL(sassURL)) {
                     var contentProvider = sourceMap.sourceContentProvider(sassURL, WebInspector.resourceTypes.Stylesheet);
-                    // Override source map content providers.
-                    this._networkProject.removeFileForURL(sassURL);
                     this._networkProject.addFileForURL(sassURL, contentProvider);
                 }
             }
 
             for (var i = 0; callbacks && i < callbacks.length; ++i)
                 callbacks[i](sourceMap);
         }
     },
 
     /**
@@ skipping 57 matching lines @@
 
     _reset: function()
     {
         /** @type {!Object.<string, !Array.<function(?WebInspector.SourceMap)>>} */
         this._pendingSourceMapLoadingCallbacks = {};
         /** @type {!Object.<string, !WebInspector.SourceMap>} */
         this._sourceMapByURL = {};
         this._sourceMapByStyleSheetURL = {};
     }
 }