arc: Use GET_INTERFACE_FOR_METHOD macro

chrome/browser/sync/test/integration/sync_arc_package_helper.cc

Index: chrome/browser/sync/test/integration/sync_arc_package_helper.cc
diff --git a/chrome/browser/sync/test/integration/sync_arc_package_helper.cc b/chrome/browser/sync/test/integration/sync_arc_package_helper.cc
index 7055a910dc77b0289733e96b4e624a5446baa4c4..82747ea1beb604fb4d71c88a3b40e8890dcb7e49 100644
--- a/chrome/browser/sync/test/integration/sync_arc_package_helper.cc
+++ b/chrome/browser/sync/test/integration/sync_arc_package_helper.cc
@@ -183,9 +183,9 @@ void SyncArcPackageHelper::InstallPackage(
     const mojom::ArcPackageInfo& package) {
   ArcAppListPrefs* arc_app_list_prefs = ArcAppListPrefs::Get(profile);
   DCHECK(arc_app_list_prefs);
-  FakeAppInstance* fake_app_instance = static_cast<FakeAppInstance*>(
-      arc_app_list_prefs->app_instance_holder()->GetInstanceForMethod(
-          "InstallPackage"));
+  FakeAppInstance* fake_app_instance =
+      static_cast<FakeAppInstance*>(GET_INSTANCE_FOR_METHOD(

[Yusuke Sato, 2017/01/04 19:59:12]

(not related to your CL, so no reply needed but.. why static_cast needed
here???)

[Luis Héctor Chávez, 2017/01/04 20:38:56]

It's not. Removed.

+          arc_app_list_prefs->app_instance_holder(), InstallPackage));
 
   DCHECK(fake_app_instance);
   // After this function, new package should be added to local sync service
@@ -197,9 +197,9 @@ void SyncArcPackageHelper::UninstallPackage(Profile* profile,
                                             const std::string& package_name) {
   ArcAppListPrefs* arc_app_list_prefs = ArcAppListPrefs::Get(profile);
   DCHECK(arc_app_list_prefs);
-  FakeAppInstance* fake_app_instance = static_cast<FakeAppInstance*>(
-      arc_app_list_prefs->app_instance_holder()->GetInstanceForMethod(
-          "UninstallPackage"));
+  FakeAppInstance* fake_app_instance =
+      static_cast<FakeAppInstance*>(GET_INSTANCE_FOR_METHOD(
+          arc_app_list_prefs->app_instance_holder(), UnInstallPackage));
   DCHECK(fake_app_instance);
   // After this function, package should be removed from local sync service
   // and uninstall event should be sent to sync server.