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

sync/test/engine/syncer_command_test.h

Index: sync/test/engine/syncer_command_test.h
diff --git a/sync/test/engine/syncer_command_test.h b/sync/test/engine/syncer_command_test.h
index c99846cd98651e8db2506d2a10b2f8f54503db7e..6b957a8ee5d5a2519d9e4ae1f5b77c8a67487e6d 100644
--- a/sync/test/engine/syncer_command_test.h
+++ b/sync/test/engine/syncer_command_test.h
@@ -31,7 +31,7 @@ using ::testing::NiceMock;
 
 namespace syncer {
 
-class MockDebugInfoGetter : public syncer::sessions::DebugInfoGetter {
+class MockDebugInfoGetter : public sessions::DebugInfoGetter {
  public:
   MockDebugInfoGetter();
   virtual ~MockDebugInfoGetter();
@@ -100,7 +100,7 @@ class SyncerCommandTestBase : public testing::Test,
 
   // Lazily create a session requesting all datatypes with no payload.
   sessions::SyncSession* session() {
-    syncer::ModelTypePayloadMap types =
+    ModelTypePayloadMap types =
         ModelSafeRoutingInfoToPayloadMap(routing_info_, std::string());
     return session(sessions::SyncSourceInfo(types));
   }