[Sync] Fix namespaces for the browser_sync component.

components/browser_sync/test_profile_sync_service.cc

Index: components/browser_sync/test_profile_sync_service.cc
diff --git a/components/browser_sync/test_profile_sync_service.cc b/components/browser_sync/test_profile_sync_service.cc
index 76b7fee9da887c2f54958779187e298e8ae0bd47..80b3349a83a16a4a1dc5245727079cf142323b7e 100644
--- a/components/browser_sync/test_profile_sync_service.cc
+++ b/components/browser_sync/test_profile_sync_service.cc
@@ -6,6 +6,8 @@
 
 #include <utility>
 
+namespace browser_sync {
+
 syncer::TestIdFactory* TestProfileSyncService::id_factory() {
   return &id_factory_;
 }
@@ -30,3 +32,5 @@ void TestProfileSyncService::OnConfigureDone(
 syncer::UserShare* TestProfileSyncService::GetUserShare() const {
   return backend_->GetUserShare();
 }
+
+}  // namespace browser_sync