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

ui/views/mus/native_widget_mus.cc

Index: ui/views/mus/native_widget_mus.cc
diff --git a/ui/views/mus/native_widget_mus.cc b/ui/views/mus/native_widget_mus.cc
index e1fbfbb6ba41986f4d466af1eae58703ceead76c..dd79ff864b3943e2b20d9400af864fe9aab175ba 100644
--- a/ui/views/mus/native_widget_mus.cc
+++ b/ui/views/mus/native_widget_mus.cc
@@ -32,7 +32,6 @@
 #include "ui/gfx/path.h"
 #include "ui/native_theme/native_theme_aura.h"
 #include "ui/platform_window/platform_window_delegate.h"
-#include "ui/views/mus/window_manager_connection.h"
 #include "ui/views/mus/window_manager_constants_converters.h"
 #include "ui/views/mus/window_manager_frame_values.h"
 #include "ui/views/mus/window_tree_host_mus.h"
@@ -688,13 +687,6 @@
   window_tree_host_->InitHost();
   hosted_window->SetProperty(kMusWindow, window_);
 
-  // TODO(moshayedi): crbug.com/641039. Investigate whether there are any cases
-  // where we need input method but don't have the WindowManagerConnection here.
-  if (WindowManagerConnection::Exists()) {
-    window_tree_host_->InitInputMethod(
-        WindowManagerConnection::Get()->connector());
-  }
-
   focus_client_.reset(
       new FocusControllerMus(new FocusRulesImpl(hosted_window)));