Remove #pragma once from content

content/public/common/page_zoom.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_COMMON_PAGE_ZOOM_H_
 #define CONTENT_PUBLIC_COMMON_PAGE_ZOOM_H_
-#pragma once
 
 #include "content/common/content_export.h"
 
 namespace content {
 
 // This enum is the parameter to various text/page zoom commands so we know
 // what the specific zoom command is.
 enum PageZoom {
   PAGE_ZOOM_OUT   = -1,
   PAGE_ZOOM_RESET = 0,
@@ skipping 14 matching lines @@
 // is precise enough for zoom value comparisons.
 CONTENT_EXPORT extern const double kEpsilon;
 
 // Test if two zoom values (either zoom factors or zoom levels) should be
 // considered equal.
 CONTENT_EXPORT bool ZoomValuesEqual(double value_a, double value_b);
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_PAGE_ZOOM_H_