Remove the 2-level input method system & InputMethodBridge.

ui/views/test/widget_test_aura.cc

Index: ui/views/test/widget_test_aura.cc
diff --git a/ui/views/test/widget_test_aura.cc b/ui/views/test/widget_test_aura.cc
index 25426078f03eb66cc5580604ab04fad988d6df15..502d7d0b247a5ccdac94377f93d5f1d1dd9a8924 100644
--- a/ui/views/test/widget_test_aura.cc
+++ b/ui/views/test/widget_test_aura.cc
@@ -104,5 +104,11 @@ ui::EventProcessor* WidgetTest::GetEventProcessor(Widget* widget) {
   return widget->GetNativeWindow()->GetHost()->event_processor();
 }
 
+// static
+ui::internal::InputMethodDelegate* WidgetTest::GetInputMethodDelegateForWidget(
+    Widget* widget) {
+  return widget->GetNativeWindow()->GetRootWindow()->GetHost();
+}
+
 }  // namespace test
 }  // namespace views