Remove InputMethodEventHandler.

ui/aura/test/aura_test_utils.cc

Index: ui/aura/test/aura_test_utils.cc
diff --git a/ui/aura/test/aura_test_utils.cc b/ui/aura/test/aura_test_utils.cc
index e86858a8a72fc05afb9872096b2186403d957759..544c262f058b576f234f253d716802fa0a7ca294 100644
--- a/ui/aura/test/aura_test_utils.cc
+++ b/ui/aura/test/aura_test_utils.cc
@@ -25,6 +25,8 @@ class WindowTreeHostTestApi {
     host_->dispatcher_ = std::move(dispatcher);
   }
 
+  void disable_ime() { host_->dispatcher_->set_skip_ime(true); }
+
  private:
   WindowTreeHost* host_;
 
@@ -42,5 +44,9 @@ void SetHostDispatcher(WindowTreeHost* host,
   host_test_api.set_dispatcher(std::move(dispatcher));
 }
 
+void DisableIME(WindowTreeHost* host) {
+  WindowTreeHostTestApi(host).disable_ime();
+}
+
 }  // namespace test
 }  // namespace aura