Add a few missing overrides found by a new clang warning.

ui/base/ime/remote_input_method_win_unittest.cc

 // Copyright 2013 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 "ui/base/ime/remote_input_method_win.h"
 
 #include <InputScope.h>
 
 #include <vector>
 
@@ skipping 86 matching lines @@
   virtual void InsertText(const base::string16& text) override {
     inserted_text_.append(text);
     ++call_count_insert_text_;
   }
   virtual ui::TextInputType GetTextInputType() const override {
     return text_input_type_;
   }
   virtual ui::TextInputMode GetTextInputMode() const override {
     return text_input_mode_;
   }
-  virtual gfx::Rect GetCaretBounds() const {
-    return caret_bounds_;
-  }
+  virtual gfx::Rect GetCaretBounds() const override { return caret_bounds_; }
   virtual bool GetCompositionCharacterBounds(uint32 index,
                                              gfx::Rect* rect) const override {
     // Emulate the situation of crbug.com/328237.
     if (emulate_pepper_flash_)
       return false;
     if (!rect || composition_character_bounds_.size() <= index)
       return false;
     *rect = composition_character_bounds_[index];
     return true;
   }
@@ skipping 124 matching lines @@
   virtual void OnBlur() override {
   }
   virtual void OnCaretBoundsChanged(const TextInputClient* client) override {
   }
   virtual void OnTextInputStateChanged(const TextInputClient* client) override {
     ++on_text_input_state_changed_;
   }
   virtual void OnInputMethodDestroyed(const InputMethod* client) override {
     ++on_input_method_destroyed_changed_;
   }
-  virtual void OnShowImeIfNeeded() {
-  }
+  virtual void OnShowImeIfNeeded() override {}
 
   size_t on_text_input_state_changed_;
   size_t on_input_method_destroyed_changed_;
   DISALLOW_COPY_AND_ASSIGN(MockInputMethodObserver);
 };
 
 typedef ScopedObserver<InputMethod, InputMethodObserver>
     InputMethodScopedObserver;
 
 TEST(RemoteInputMethodWinTest, RemoteInputMethodPrivateWin) {
@@ skipping 571 matching lines @@
   scoped_ptr<InputMethod> input_method(CreateRemoteInputMethodWin(&delegate_));
   input_method->AddObserver(&input_method_observer);
 
   EXPECT_EQ(0u, input_method_observer.on_input_method_destroyed_changed());
   input_method.reset();
   EXPECT_EQ(1u, input_method_observer.on_input_method_destroyed_changed());
 }
 
 }  // namespace
 }  // namespace ui