[Sync] Replacing NULL with nullptr/null throughout sync code.

chrome/browser/sync/test/integration/performance/autofill_sync_perf_test.cc

 // Copyright (c) 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 <stddef.h>
 
 #include "base/macros.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/sync/test/integration/autofill_helper.h"
@@ skipping 147 matching lines @@
   return IntToValue(value_number_++);
 }
 
 const std::string AutofillSyncPerfTest::IntToValue(int n) {
   return base::StringPrintf("Value%d", n);
 }
 
 void ForceSync(int profile) {
   static int id = 0;
   ++id;
-  EXPECT_TRUE(
-      bookmarks_helper::AddURL(profile, 0,
-                               bookmarks_helper::IndexedURLTitle(id),
-                               GURL(bookmarks_helper::IndexedURL(id))) != NULL);
+  EXPECT_TRUE(bookmarks_helper::AddURL(
+                  profile, 0, bookmarks_helper::IndexedURLTitle(id),
+                  GURL(bookmarks_helper::IndexedURL(id))) != nullptr);
 }
 
 IN_PROC_BROWSER_TEST_F(AutofillSyncPerfTest, AutofillProfiles_P0) {
   ASSERT_TRUE(SetupSync()) << "SetupSync() failed.";
 
   // TCM ID - 7557873.
   AddProfiles(0, kNumProfiles);
   base::TimeDelta dt = TimeMutualSyncCycle(GetClient(0), GetClient(1));
   ASSERT_EQ(kNumProfiles, GetProfileCount(1));
   PrintResult("autofill", "add_autofill_profiles", dt);
@@ skipping 21 matching lines @@
   ASSERT_EQ(kNumKeys, GetKeyCount(1));
   PrintResult("autofill", "add_autofill_keys", dt);
 
   RemoveKeys(0);
   // TODO(lipalani): fix this. The following line is added to force sync.
   ForceSync(0);
   dt = TimeMutualSyncCycle(GetClient(0), GetClient(1));
   ASSERT_EQ(0, GetKeyCount(1));
   PrintResult("autofill", "delete_autofill_keys", dt);
 }