[Sync] Fix namespaces for the browser_sync component.

chrome/browser/browsing_data/history_counter_browsertest.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 "components/browsing_data/core/counters/history_counter.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/run_loop.h"
 #include "chrome/browser/history/history_service_factory.h"
@@ skipping 365 matching lines @@
   EXPECT_FALSE(HasSyncedVisits());
 }
 
 // Test that the counting restarts when history sync state changes.
 // TODO(crbug.com/553421): Enable this test and move it to the
 // sync/test/integration directory.
 IN_PROC_BROWSER_TEST_F(HistoryCounterTest, DISABLED_RestartOnSyncChange) {
   // Set up the Sync client.
   ASSERT_TRUE(SetupClients());
   static const int kFirstProfileIndex = 0;
-  ProfileSyncService* sync_service = GetSyncService(kFirstProfileIndex);
+  browser_sync::ProfileSyncService* sync_service =
+      GetSyncService(kFirstProfileIndex);
   Profile* profile = GetProfile(kFirstProfileIndex);
 
   // Set up the fake web history service and the counter.
 
   browsing_data::HistoryCounter counter(
       GetHistoryService(),
       base::Bind(&HistoryCounterTest::GetFakeWebHistoryService,
                  base::Unretained(this),
                  base::Unretained(profile),
                  true),
@@ skipping 54 matching lines @@
   // history deletion did not change. However, in reality we can get two
   // notifications, one that history sync has stopped and another that it is
   // active again.
 
   // Stopping the Sync service triggers a restart.
   sync_service->RequestStop(sync_driver::SyncService::CLEAR_DATA);
   WaitForCountingOrConfirmFinished();
 }
 
 }  // namespace