[Sync] Move //components/sync to the syncer namespace.

components/sync/core/data_batch_impl_unittest.cc

Index: components/sync/core/data_batch_impl_unittest.cc
diff --git a/components/sync/core/data_batch_impl_unittest.cc b/components/sync/core/data_batch_impl_unittest.cc
index 86025cb6363153037dce745a5296edcff70411aa..3b98230e6d600ddf1e298944e08b916d19d4a424 100644
--- a/components/sync/core/data_batch_impl_unittest.cc
+++ b/components/sync/core/data_batch_impl_unittest.cc
@@ -7,7 +7,7 @@
 #include "base/memory/ptr_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-namespace syncer_v2 {
+namespace syncer {
 
 TEST(DataBatchImplTest, PutAndNextWithReuse) {
   EntityData* entity1 = new EntityData();
@@ -88,4 +88,4 @@ TEST(DataBatchImplTest, PutAndNextSharedKey) {
   EXPECT_EQ(entity2, pair2.second.get());
 }
 
-}  // namespace syncer_v2
+}  // namespace syncer