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

sync/internal_api/js_sync_manager_observer.h

Index: sync/internal_api/js_sync_manager_observer.h
diff --git a/sync/internal_api/js_sync_manager_observer.h b/sync/internal_api/js_sync_manager_observer.h
index e26c8f46db45535a1589c400dcd8fcdbf4682ff1..0988670ee6bd7eb0939af85bfb22baab8e77bf17 100644
--- a/sync/internal_api/js_sync_manager_observer.h
+++ b/sync/internal_api/js_sync_manager_observer.h
@@ -23,34 +23,33 @@ class JsEventDetails;
 class JsEventHandler;
 
 // Routes SyncManager events to a JsEventHandler.
-class JsSyncManagerObserver : public syncer::SyncManager::Observer {
+class JsSyncManagerObserver : public SyncManager::Observer {
  public:
   JsSyncManagerObserver();
   virtual ~JsSyncManagerObserver();
 
   void SetJsEventHandler(const WeakHandle<JsEventHandler>& event_handler);
 
-  // syncer::SyncManager::Observer implementation.
+  // SyncManager::Observer implementation.
   virtual void OnSyncCycleCompleted(
       const sessions::SyncSessionSnapshot& snapshot) OVERRIDE;
-  virtual void OnConnectionStatusChange(
-      syncer::ConnectionStatus status) OVERRIDE;
+  virtual void OnConnectionStatusChange(ConnectionStatus status) OVERRIDE;
   virtual void OnUpdatedToken(const std::string& token) OVERRIDE;
   virtual void OnPassphraseRequired(
-      syncer::PassphraseRequiredReason reason,
+      PassphraseRequiredReason reason,
       const sync_pb::EncryptedData& pending_keys) OVERRIDE;
   virtual void OnPassphraseAccepted() OVERRIDE;
   virtual void OnBootstrapTokenUpdated(
       const std::string& bootstrap_token) OVERRIDE;
   virtual void OnEncryptedTypesChanged(
-      syncer::ModelTypeSet encrypted_types,
+      ModelTypeSet encrypted_types,
       bool encrypt_everything) OVERRIDE;
   virtual void OnEncryptionComplete() OVERRIDE;
   virtual void OnInitializationComplete(
       const WeakHandle<JsBackend>& js_backend, bool success) OVERRIDE;
   virtual void OnStopSyncingPermanently() OVERRIDE;
   virtual void OnActionableError(
-      const syncer::SyncProtocolError& sync_protocol_error) OVERRIDE;
+      const SyncProtocolError& sync_protocol_error) OVERRIDE;
 
  private:
   void HandleJsEvent(const tracked_objects::Location& from_here,