Revert of IME for Mus: Make InputMethodMus use the IME Mojo API.

ui/views/mus/window_tree_host_mus.cc

Index: ui/views/mus/window_tree_host_mus.cc
diff --git a/ui/views/mus/window_tree_host_mus.cc b/ui/views/mus/window_tree_host_mus.cc
index 3629f2f50764a00bfb5ade96d300108e46515b0f..3f38b4e1ea7ab23a2eb4798d2317b817c3c44298 100644
--- a/ui/views/mus/window_tree_host_mus.cc
+++ b/ui/views/mus/window_tree_host_mus.cc
@@ -54,17 +54,13 @@
   dispatcher()->set_transform_events(false);
   compositor()->SetHostHasTransparentBackground(true);
 
-  input_method_.reset(new InputMethodMus(this, window));
+  input_method_.reset(new InputMethodMUS(this, window));
   SetSharedInputMethod(input_method_.get());
 }
 
 WindowTreeHostMus::~WindowTreeHostMus() {
   DestroyCompositor();
   DestroyDispatcher();
-}
-
-void WindowTreeHostMus::InitInputMethod(shell::Connector* connector) {
-  input_method_->Init(connector);
 }
 
 void WindowTreeHostMus::DispatchEvent(ui::Event* event) {