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

components/ui/zoom/page_zoom_constants.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright 2015 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 "chrome/browser/chrome_page_zoom_constants.h"
+#include "components/ui/zoom/page_zoom_constants.h"
 
-namespace chrome_page_zoom {
+#include "base/macros.h"
+
+namespace ui_zoom {
 
 // This list is duplicated in chrome/browser/resources/pdf/viewport.js. Please
 // make sure the two match.
 const double kPresetZoomFactors[] = { 0.25, 0.333, 0.5, 0.666, 0.75, 0.9, 1.0,
                                       1.1, 1.25, 1.5, 1.75, 2.0, 2.5, 3.0, 4.0,
                                       5.0 };
-const size_t kPresetZoomFactorsSize = arraysize(kPresetZoomFactors);
+const std::size_t kPresetZoomFactorsSize = arraysize(kPresetZoomFactors);
 
-}  // namespace chrome_page_zoom
+}  // namespace ui_zoom