Switch to standard integer types in components/, part 4 of 4.

components/ui/zoom/page_zoom.cc

 // 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 "components/ui/zoom/page_zoom.h"
 
+#include <stddef.h>
+
 #include <algorithm>
 #include <cmath>
 
 #include "base/prefs/pref_service.h"
 #include "components/ui/zoom/page_zoom_constants.h"
 #include "components/ui/zoom/zoom_controller.h"
 #include "content/public/browser/host_zoom_map.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/user_metrics.h"
 #include "content/public/browser/web_contents.h"
@@ skipping 102 matching lines @@
         zoom_controller->SetZoomLevel(zoom_level);
         content::RecordAction(UserMetricsAction("ZoomPlus"));
         return;
       }
     }
     content::RecordAction(UserMetricsAction("ZoomPlus_AtMaximum"));
   }
 }
 
 }  // namespace ui_zoom