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

sync/internal_api/syncapi_server_connection_manager.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sync/internal_api/syncapi_server_connection_manager.h"
 
 #include "net/base/net_errors.h"
 #include "net/http/http_status_code.h"
 #include "sync/internal_api/public/http_post_provider_factory.h"
 #include "sync/internal_api/public/http_post_provider_interface.h"
 
-using syncer::HttpResponse;
-
 namespace syncer {
 
 SyncAPIBridgedConnection::SyncAPIBridgedConnection(
-    syncer::ServerConnectionManager* scm,
+    ServerConnectionManager* scm,
     HttpPostProviderFactory* factory)
     : Connection(scm), factory_(factory) {
   post_provider_ = factory_->Create();
 }
 
 SyncAPIBridgedConnection::~SyncAPIBridgedConnection() {
   DCHECK(post_provider_);
   factory_->Destroy(post_provider_);
   post_provider_ = NULL;
 }
@@ skipping 62 matching lines @@
     int port,
     bool use_ssl,
     HttpPostProviderFactory* factory)
     : ServerConnectionManager(server, port, use_ssl),
       post_provider_factory_(factory) {
   DCHECK(post_provider_factory_.get());
 }
 
 SyncAPIServerConnectionManager::~SyncAPIServerConnectionManager() {}
 
-syncer::ServerConnectionManager::Connection*
+ServerConnectionManager::Connection*
 SyncAPIServerConnectionManager::MakeConnection() {
   return new SyncAPIBridgedConnection(this, post_provider_factory_.get());
 }
 
 }  // namespace syncer