clang/win: Fix most -Wunused-function warnings in Chromium code.

ui/base/test/ui_controls_internal_win.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/test/ui_controls_internal_win.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
@@ skipping 130 matching lines @@
 bool FillKeyboardInput(ui::KeyboardCode key, INPUT* input, bool key_up) {
   memset(input, 0, sizeof(INPUT));
   input->type = INPUT_KEYBOARD;
   input->ki.wVk = ui::WindowsKeyCodeForKeyboardCode(key);
   input->ki.dwFlags = key_up ? KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP :
                                KEYEVENTF_EXTENDEDKEY;
 
   return true;
 }
 
-// Send a key event (up/down)
-bool SendKeyEvent(ui::KeyboardCode key, bool up) {
-  INPUT input = { 0 };
-
-  if (!FillKeyboardInput(key, &input, up))
-    return false;
-
-  if (!::SendInput(1, &input, sizeof(INPUT)))
-    return false;
-
-  return true;
-}
-
 }  // namespace
 
 namespace ui_controls {
 namespace internal {
 
 bool SendKeyPressImpl(HWND window,
                       ui::KeyboardCode key,
                       bool control,
                       bool shift,
                       bool alt,
@@ skipping 161 matching lines @@
     return false;
 
   if (dispatcher.get())
     dispatcher->AddRef();
 
   return true;
 }
 
 }  // namespace internal
 }  // namespace ui_controls