Switch to standard integer types in chrome/browser/, part 2 of 4.

chrome/browser/manifest/manifest_icon_downloader.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 "chrome/browser/manifest/manifest_icon_downloader.h"
 
+#include <stddef.h>
+
 #include <limits>
 
 #include "chrome/browser/manifest/manifest_icon_selector.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/common/console_message_level.h"
 #include "skia/ext/image_operations.h"
 #include "ui/gfx/screen.h"
@@ skipping 177 matching lines @@
     float ratio = height / width;
     float ratio_difference = fabs(ratio - 1);
     if (ratio_difference < best_ratio_difference) {
       best_index = i;
       best_ratio_difference = ratio_difference;
     }
   }
 
   return best_index;
 }