[WIP] make GURL::path() return a StringPiece

net/base/mac/url_conversions.mm

 // Copyright 2012 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.
 
 #import "net/base/mac/url_conversions.h"
 
 #import <Foundation/Foundation.h>
 
 #include "base/mac/scoped_nsobject.h"
 #include "net/base/escape.h"
 #include "url/gurl.h"
 #include "url/url_canon.h"
 
 namespace net {
 
 NSURL* NSURLWithGURL(const GURL& url) {
   if (!url.is_valid())
     return nil;
 
   // NSURL strictly enforces RFC 1738 which requires that certain characters
   // are always encoded. These characters are: "<", ">", """, "#", "%", "{",
   // "}", "|", "\", "^", "~", "[", "]", and "`".
   //
   // GURL leaves some of these characters unencoded in the path, query, and
   // ref. This function manually encodes those components, and then passes the
   // result to NSURL.
   GURL::Replacements replacements;
-  std::string escaped_path = EscapeNSURLPrecursor(url.path());
+  std::string escaped_path = EscapeNSURLPrecursor(url.path().as_string());
   std::string escaped_query = EscapeNSURLPrecursor(url.query());
   std::string escaped_ref = EscapeNSURLPrecursor(url.ref());
   if (!escaped_path.empty()) {
     replacements.SetPath(escaped_path.c_str(),
                          url::Component(0, escaped_path.size()));
   }
   if (!escaped_query.empty()) {
     replacements.SetQuery(escaped_query.c_str(),
                           url::Component(0, escaped_query.size()));
   }
   if (!escaped_ref.empty()) {
     replacements.SetRef(escaped_ref.c_str(),
                         url::Component(0, escaped_ref.size()));
   }
   GURL escaped_url = url.ReplaceComponents(replacements);
 
   base::scoped_nsobject<NSString> escaped_url_string(
       [[NSString alloc] initWithUTF8String:escaped_url.spec().c_str()]);
   return [NSURL URLWithString:escaped_url_string];
 }
 
 GURL GURLWithNSURL(NSURL* url) {
   if (url)
     return GURL([[url absoluteString] UTF8String]);
   return GURL();
 }
 
 }  // namespace net