[Sync] Remove unneeded 'using syncer::' lines and 'syncer::' scopings

sync/engine/syncer_proto_util_unittest.cc

Index: sync/engine/syncer_proto_util_unittest.cc
diff --git a/sync/engine/syncer_proto_util_unittest.cc b/sync/engine/syncer_proto_util_unittest.cc
index 21735d8b88a6899e70459e83123c30cc14673419..8e031a1160ef7837f86e2893cdcab466f7b1e833 100644
--- a/sync/engine/syncer_proto_util_unittest.cc
+++ b/sync/engine/syncer_proto_util_unittest.cc
@@ -207,7 +207,7 @@ TEST_F(SyncerProtoUtilTest, AddRequestBirthday) {
   EXPECT_EQ(msg.store_birthday(), "meat");
 }
 
-class DummyConnectionManager : public syncer::ServerConnectionManager {
+class DummyConnectionManager : public ServerConnectionManager {
  public:
   DummyConnectionManager()
       : ServerConnectionManager("unused", 0, false),
@@ -268,10 +268,10 @@ TEST_F(SyncerProtoUtilTest, PostAndProcessHeaders) {
 TEST_F(SyncerProtoUtilTest, HandleThrottlingWithDatatypes) {
   ThrottledDataTypeTracker tracker(NULL);
   SyncProtocolError error;
-  error.error_type = syncer::THROTTLED;
-  syncer::ModelTypeSet types;
-  types.Put(syncer::BOOKMARKS);
-  types.Put(syncer::PASSWORDS);
+  error.error_type = THROTTLED;
+  ModelTypeSet types;
+  types.Put(BOOKMARKS);
+  types.Put(PASSWORDS);
   error.error_data_types = types;
 
   base::TimeTicks ticks = base::TimeTicks::FromInternalValue(1);
@@ -283,7 +283,7 @@ TEST_F(SyncerProtoUtilTest, HandleThrottlingNoDatatypes) {
   ThrottledDataTypeTracker tracker(NULL);
   MockDelegate delegate;
   SyncProtocolError error;
-  error.error_type = syncer::THROTTLED;
+  error.error_type = THROTTLED;
 
   base::TimeTicks ticks = base::TimeTicks::FromInternalValue(1);