Refactor to move chrome_page_zoom functions to components/ui/zoom.

chrome/browser/chrome_page_zoom.h

-// Copyright (c) 2012 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 CHROME_BROWSER_CHROME_PAGE_ZOOM_H_
-#define CHROME_BROWSER_CHROME_PAGE_ZOOM_H_
-
-#include <vector>
-#include "content/public/common/page_zoom.h"
-
-namespace content {
-class WebContents;
-}
-
-namespace chrome_page_zoom {
-
-// Return a sorted vector of zoom factors. The vector will consist of preset
-// values along with a custom value (if the custom value is not already
-// represented.)
-std::vector<double> PresetZoomFactors(double custom_factor);
-
-// Return a sorted vector of zoom levels. The vector will consist of preset
-// values along with a custom value (if the custom value is not already
-// represented.)
-std::vector<double> PresetZoomLevels(double custom_level);
-
-// Adjusts the zoom level of |web_contents|.
-void Zoom(content::WebContents* web_contents, content::PageZoom zoom);
-
-}  // namespace chrome_page_zoom
-
-#endif  // CHROME_BROWSER_CHROME_PAGE_ZOOM_H_