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

ios/net/cookies/cookie_store_ios_unittest.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.
 
 #include "ios/net/cookies/cookie_store_ios.h"
 
 #import <Foundation/Foundation.h>
 
 #include <memory>
 
@@ skipping 387 matching lines @@
     // Wait until the flush is posted.
     base::RunLoop().RunUntilIdle();
   }
 
   void SetSystemCookie(const GURL& url,
                        const std::string& name,
                        const std::string& value) {
     NSHTTPCookieStorage* storage =
         [NSHTTPCookieStorage sharedHTTPCookieStorage];
     [storage setCookie:[NSHTTPCookie cookieWithProperties:@{
-      NSHTTPCookiePath : base::SysUTF8ToNSString(url.path()),
+      NSHTTPCookiePath : base::SysUTF8ToNSString(url.path().as_string()),
       NSHTTPCookieName : base::SysUTF8ToNSString(name),
       NSHTTPCookieValue : base::SysUTF8ToNSString(value),
       NSHTTPCookieDomain : base::SysUTF8ToNSString(url.host()),
     }]];
     net::CookieStoreIOS::NotifySystemCookiesChanged();
     base::RunLoop().RunUntilIdle();
   }
 
   void DeleteSystemCookie(const GURL& gurl, const std::string& name) {
     NSHTTPCookieStorage* storage =
@@ skipping 574 matching lines @@
   EXPECT_EQ(2U, cookies.size());
   // this deletes the callback
   handle.reset();
   SetSystemCookie(kTestCookieURL, "abc", "jkl");
   EXPECT_EQ(2U, cookies.size());
   DeleteSystemCookie(kTestCookieURL, "abc");
   store_->UnSynchronize();
 }
 
 }  // namespace net