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

ios/net/cookies/cookie_cache_unittest.cc

Index: ios/net/cookies/cookie_cache_unittest.cc
diff --git a/ios/net/cookies/cookie_cache_unittest.cc b/ios/net/cookies/cookie_cache_unittest.cc
index f1ec53a81cdaf9d578369e42319b0b78b4cdcb70..79f47939b3df89598ef95477aa1d943fbc38cb44 100644
--- a/ios/net/cookies/cookie_cache_unittest.cc
+++ b/ios/net/cookies/cookie_cache_unittest.cc
@@ -17,10 +17,10 @@ namespace {
 CanonicalCookie MakeCookie(const GURL& url,
                            const std::string& name,
                            const std::string& value) {
-  return *CanonicalCookie::Create(url, name, value, std::string(), url.path(),
-                                  base::Time(), base::Time(), false, false,
-                                  net::CookieSameSite::DEFAULT_MODE, false,
-                                  net::COOKIE_PRIORITY_DEFAULT);
+  return *CanonicalCookie::Create(
+      url, name, value, std::string(), url.path().as_string(), base::Time(),
+      base::Time(), false, false, net::CookieSameSite::DEFAULT_MODE, false,
+      net::COOKIE_PRIORITY_DEFAULT);
 }
 
 }  // namespace