IME for Mus: Remove OnTextInputModeChanged() from IME's mojo API.

services/ui/ime/test_ime_driver/test_ime_driver.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "services/ui/ime/test_ime_driver/test_ime_driver.h"
 
 #include "services/ui/public/interfaces/ime/ime.mojom.h"
 
 namespace ui {
 namespace test {
 
 class TestInputMethod : public mojom::InputMethod {
  public:
   explicit TestInputMethod(mojom::TextInputClientPtr client)
       : client_(std::move(client)) {}
   ~TestInputMethod() override {}
 
  private:
   // mojom::InputMethod:
-  void OnTextInputModeChanged(TextInputMode text_input_mode) override {}
   void OnTextInputTypeChanged(TextInputType text_input_type) override {}
   void OnCaretBoundsChanged(const gfx::Rect& caret_bounds) override {}
   void ProcessKeyEvent(std::unique_ptr<Event> key_event,
                        const ProcessKeyEventCallback& callback) override {
     DCHECK(key_event->IsKeyEvent());
 
     if (key_event->AsKeyEvent()->is_char()) {
       client_->InsertChar(std::move(key_event));
       callback.Run(true);
     } else {
@@ skipping 20 matching lines @@
           new TestInputMethod(std::move(client)),
           std::move(input_method_request)));
 }
 
 void TestIMEDriver::CancelSession(int32_t session_id) {
   input_method_bindings_.erase(session_id);
 }
 
 }  // namespace test
 }  // namespace ui