[Sync] Remove some http-related chrome deps from SyncBackendHostImpl.

chrome/browser/sync/glue/sync_backend_host_mock.cc

Index: chrome/browser/sync/glue/sync_backend_host_mock.cc
diff --git a/chrome/browser/sync/glue/sync_backend_host_mock.cc b/chrome/browser/sync/glue/sync_backend_host_mock.cc
index f43547b52dee211a7b411c127e327ee255e03cfa..59c015d5fd82c16e06f2cb7cf7670b169485efc2 100644
--- a/chrome/browser/sync/glue/sync_backend_host_mock.cc
+++ b/chrome/browser/sync/glue/sync_backend_host_mock.cc
@@ -28,7 +28,7 @@ void SyncBackendHostMock::Initialize(
     const syncer::WeakHandle<syncer::UnrecoverableErrorHandler>&
         unrecoverable_error_handler,
     const base::Closure& report_unrecoverable_error_function,
-    syncer::NetworkResources* network_resources,
+    const HttpPostProviderFactoryGetter& http_post_provider_factory_getter,
     scoped_ptr<syncer::SyncEncryptionHandler::NigoriState> saved_nigori_state) {
   frontend->OnBackendInitialized(
       syncer::WeakHandle<syncer::JsBackend>(),