Enable Config::MUS to use classic IME instead of servicified IME.

ui/views/mus/views_mus_test_suite.cc

 // Copyright 2016 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 "ui/views/mus/views_mus_test_suite.h"
 
 #include <memory>
 #include <string>
 
 #include "base/command_line.h"
@@ skipping 93 matching lines @@
     NativeWidget* native_widget =
         mus_client_->CreateNativeWidget(init_params, delegate);
     if (!native_widget)
       return nullptr;
 
     // Disable sending KeyEvents to IME as tests aren't set up to wait for an
     // ack (and tests run concurrently).
     aura::WindowTreeHostMus* window_tree_host_mus =
         static_cast<aura::WindowTreeHostMus*>(
             static_cast<DesktopNativeWidgetAura*>(native_widget)->host());
-    aura::InputMethodMusTestApi::Disable(window_tree_host_mus->input_method());
+    aura::InputMethodMus* input_method_mus =
+        window_tree_host_mus->input_method_mus_for_testing();
+    DCHECK(input_method_mus);
+    aura::InputMethodMusTestApi::Disable(input_method_mus);
     return native_widget;
   }
 
   std::unique_ptr<MusClient> mus_client_;
   ui::FakeContextFactory context_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PlatformTestHelperMus);
 };
 
 std::unique_ptr<PlatformTestHelper> CreatePlatformTestHelper(
@@ skipping 138 matching lines @@
 
 void ViewsMusTestSuite::InitializeEnv() {
   env_ = aura::Env::CreateInstance(aura::Env::Mode::MUS);
 }
 
 void ViewsMusTestSuite::DestroyEnv() {
   env_.reset();
 }
 
 }  // namespace views