[Sync] Fix namespaces for the browser_sync component.

chrome/browser/browsing_data/history_counter_browsertest.cc

Index: chrome/browser/browsing_data/history_counter_browsertest.cc
diff --git a/chrome/browser/browsing_data/history_counter_browsertest.cc b/chrome/browser/browsing_data/history_counter_browsertest.cc
index c790ed9cd0f09c37849647849249d916114afc57..1156af6b97a7fb6f8c5800567ab81917d0d623ed 100644
--- a/chrome/browser/browsing_data/history_counter_browsertest.cc
+++ b/chrome/browser/browsing_data/history_counter_browsertest.cc
@@ -383,7 +383,8 @@ 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.