aura: Make aura::TooltipClient completely static?

ui/views/test/test_tooltip_client.cc

-// Copyright (c) 2011 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/views/test/test_tooltip_client.h"
-
-#include "ui/base/resource/resource_bundle.h"
-#include "ui/gfx/font.h"
-#include "ui/gfx/point.h"
-#include "ui/gfx/rect.h"
-#include "ui/gfx/screen.h"
-
-namespace aura {
-
-// static
-gfx::Font TooltipClient::GetDefaultFont() {
-  return ui::ResourceBundle::GetSharedInstance().GetFont(
-      ui::ResourceBundle::BaseFont);
-}
-
-// static
-int TooltipClient::GetMaxWidth(int x, int y) {
-  gfx::Rect monitor_bounds =
-      gfx::Screen::GetMonitorAreaNearestPoint(gfx::Point(x, y));
-  return (monitor_bounds.width() + 1) / 2;
-}
-
-}  // namespace aura