Add operator==(const GURL&, const StringPiece&) to gurl.h

chrome/browser/password_manager/native_backend_libsecret_unittest.cc

 // Copyright (c) 2015 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 <stdarg.h>
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/location.h"
 #include "base/run_loop.h"
@@ skipping 890 matching lines @@
 
   // Set the canonical forms to the updated value for the following comparison.
   form_google_.skip_zero_click = true;
   form_facebook_.skip_zero_click = true;
   PasswordStoreChangeList expected_changes;
   expected_changes.push_back(
       PasswordStoreChange(PasswordStoreChange::UPDATE, form_facebook_));
 
   PasswordStoreChangeList changes;
   EXPECT_TRUE(backend.DisableAutoSignInForOrigins(
-      base::Bind(&GURL::operator==, base::Unretained(&form_facebook_.origin)),
+      base::Bind(static_cast<bool (*)(const GURL&, const GURL&)>(operator==),
+                 form_facebook_.origin),
       &changes));
   CheckPasswordChanges(expected_changes, changes);
 
   EXPECT_EQ(2u, global_mock_libsecret_items->size());
   CheckStringAttribute((*global_mock_libsecret_items)[0],
                        "origin_url", form_google_.origin.spec());
   CheckUint32Attribute((*global_mock_libsecret_items)[0],
                        "should_skip_zero_click", 0);
   CheckStringAttribute((*global_mock_libsecret_items)[1],
                        "origin_url", form_facebook_.origin.spec());
@@ skipping 53 matching lines @@
   EXPECT_EQ(form_google_, *form_list[0]);
 
   EXPECT_EQ(1u, global_mock_libsecret_items->size());
   if (!global_mock_libsecret_items->empty()) {
     CheckMockSecretItem((*global_mock_libsecret_items)[0], form_google_,
                         "chrome-42");
   }
 }
 
 // TODO(mdm): add more basic tests here at some point.