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

ui/base/ime/remote_input_method_win_unittest.cc

Index: ui/base/ime/remote_input_method_win_unittest.cc
diff --git a/ui/base/ime/remote_input_method_win_unittest.cc b/ui/base/ime/remote_input_method_win_unittest.cc
index 5cf8aa3db992db6b29fee6fdea03556ccfe6174d..cccc5e4a3457dc34ebefbb5347fde2e98b7d55e3 100644
--- a/ui/base/ime/remote_input_method_win_unittest.cc
+++ b/ui/base/ime/remote_input_method_win_unittest.cc
@@ -104,9 +104,7 @@ class MockTextInputClient : public DummyTextInputClient {
   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.
@@ -251,8 +249,7 @@ class MockInputMethodObserver : public InputMethodObserver {
   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_;