Compile fix for gcc 4.6 (WebDataService::Handle is typedef of int).

chrome/browser/sync/profile_sync_service_autofill_unittest.cc

 // Copyright (c) 2011 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 <set>
 #include <string>
 #include <vector>
 
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 176 matching lines @@
 
   virtual WebDataService::Handle GetAllTokens(
       WebDataServiceConsumer* consumer) OVERRIDE {
     // TODO(tim): It would be nice if WebDataService was injected on
     // construction of TokenService rather than fetched by Initialize so that
     // this isn't necessary (we could pass a NULL service). We currently do
     // return it via EXPECT_CALLs, but without depending on order-of-
     // initialization (which seems way more fragile) we can't tell which
     // component is asking at what time, and some components in these Autofill
     // tests require a WebDataService.
-    return NULL;
+    return 0;
   }
 
   virtual AutocompleteSyncableService*
       GetAutocompleteSyncableService() const OVERRIDE {
     EXPECT_TRUE(BrowserThread::CurrentlyOn(BrowserThread::DB));
     EXPECT_TRUE(autocomplete_syncable_service_);
 
     return autocomplete_syncable_service_;
   }
 
@@ skipping 942 matching lines @@
   std::vector<AutofillEntry> sync_entries;
   std::vector<AutofillProfile> sync_profiles;
   ASSERT_TRUE(GetAutofillEntriesFromSyncDB(&sync_entries, &sync_profiles));
   EXPECT_EQ(3U, sync_entries.size());
   EXPECT_EQ(0U, sync_profiles.size());
   for (size_t i = 0; i < sync_entries.size(); i++) {
     DVLOG(1) << "Entry " << i << ": " << sync_entries[i].key().name()
              << ", " << sync_entries[i].key().value();
   }
 }