Extract content dependency from keyboard code

ui/keyboard/keyboard.h

Index: ui/keyboard/keyboard.h
diff --git a/ui/keyboard/keyboard.h b/ui/keyboard/keyboard.h
deleted file mode 100644
index 0878b7b90e71f28e815dad6111c4e593eece371b..0000000000000000000000000000000000000000
--- a/ui/keyboard/keyboard.h
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright (c) 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.
-
-#ifndef UI_KEYBOARD_KEYBOARD_H_
-#define UI_KEYBOARD_KEYBOARD_H_
-
-#include "ui/keyboard/keyboard_export.h"
-
-namespace keyboard {
-
-// Initializes the keyboard module. This includes adding the necessary pak files
-// for loading resources used in for the virtual keyboard. This becomes a no-op
-// after the first call.
-KEYBOARD_EXPORT void InitializeKeyboard();
-
-}  // namespace keyboard
-
-#endif  //  UI_KEYBOARD_KEYBOARD_H_