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

services/ui/ime/test_ime_driver/main.cc

Index: services/ui/ime/test_ime_driver/main.cc
diff --git a/services/ui/ime/test_ime_driver/main.cc b/services/ui/ime/test_ime_driver/main.cc
index 9bed1aa5c038cb25f82587589c56a13e67dfb6ff..795119fae475224c2aec838161eb6557c8a38013 100644
--- a/services/ui/ime/test_ime_driver/main.cc
+++ b/services/ui/ime/test_ime_driver/main.cc
@@ -18,10 +18,6 @@
 
  private:
   // shell::Service:
-  bool OnConnect(const shell::Identity& remote_identity,
-                 shell::InterfaceRegistry* registry) override {
-    return true;
-  }
   void OnStart(const shell::Identity& identity) override {
     mojom::IMEDriverPtr ime_driver_ptr;
     new TestIMEDriver(GetProxy(&ime_driver_ptr));