Only do aggressive metro viewer termination in tests

ash/test/ash_test_base.cc

Index: ash/test/ash_test_base.cc
diff --git a/ash/test/ash_test_base.cc b/ash/test/ash_test_base.cc
index 166e2b7d007df4a1aebf69a5e40342c9c753bfae..fb2eb25d4e4ad6babf25073e93c0a40792e02bee 100644
--- a/ash/test/ash_test_base.cc
+++ b/ash/test/ash_test_base.cc
@@ -147,7 +147,7 @@ void AshTestBase::SetUp() {
       ipc_thread_->StartWithOptions(options);
       metro_viewer_host_.reset(
           new TestMetroViewerProcessHost(ipc_thread_->message_loop_proxy()));
-      CHECK(metro_viewer_host_->LaunchViewerAndWaitForConnection(
+      CHECK(metro_viewer_host_->LaunchViewerAndWaitForConnectionForTests(
           win8::test::kDefaultTestAppUserModelId));
       aura::RemoteWindowTreeHostWin* window_tree_host =
           aura::RemoteWindowTreeHostWin::Instance();