Make GetURLForDebugging return a const GURL

webkit/glue/resource_loader_bridge.h

 // Copyright (c) 2006-2008 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.
 //
 // The intent of this file is to provide a type-neutral abstraction between
 // Chrome and WebKit for resource loading. This pure-virtual interface is
 // implemented by the embedder, which also provides a factory method Create
 // to instantiate this object.
 //
 // One of these objects will be created by WebKit for each request. WebKit
@@ skipping 114 matching lines @@
     // be called multiple times or not at all if an error occurs.
     virtual void OnReceivedData(const char* data, int len) = 0;
 
     // Called when the response is complete.  This method signals completion of
     // the resource load.ff
     virtual void OnCompletedRequest(const URLRequestStatus& status,
                                     const std::string& security_info) = 0;
 
     // Returns the URL of the request, which allows us to display it in
     // debugging situations.
-    virtual std::string GetURLForDebugging() = 0;
+    virtual GURL GetURLForDebugging() const = 0;
   };
 
   // use Create() for construction, but anybody can delete at any time,
   // INCLUDING during processing of callbacks.
   virtual ~ResourceLoaderBridge();
 
   // Call this method to make a new instance.  The method name is a HTTP-style
   // method name (e.g., "GET" or "POST").  The URL should be an absolute URL
   // encoded in ASCII per the rules of RFC-2396.  The referrer parameter is
   // optional (may be NULL) and is a URL with similar constraints in how it
@@ skipping 80 matching lines @@
   // construction must go through Create()
   ResourceLoaderBridge();
 
  private:
   DISALLOW_EVIL_CONSTRUCTORS(ResourceLoaderBridge);
 };
 
 }  // namespace webkit_glue
 
 #endif  // RESOURCE_LOADER_BRIDGE_