DevTools: [Persistence] implement automapping

third_party/WebKit/LayoutTests/http/tests/inspector/persistence/persistence-sync-content-nodejs-expected.txt

 Verify that syncing Node.js contents works fine.
 
 Initial fileSystem content:
     #!/usr/bin/env node
     
     var express = require("express");
     //TODO
 
  Initial network content:
     (function (exports, require, module, __filename, __dirname) { 
     var express = require("express");
     //TODO
     });
 Binding created: {
        network: http://127.0.0.1:8000/nodejs.js
     fileSystem: file:///var/www/nodejs.js
+    exactMatch: false
 }
 
 Running: Edit network uiSourceCode
 Network:
     (function (exports, require, module, __filename, __dirname) { 
     var express = require("express");
     network();
     //TODO
     });
 
@@ skipping 14 matching lines @@
     });
 
 FileSystem:
     #!/usr/bin/env node
     
     var express = require("express");
     filesystem();
     //TODO