Decompose //extensions/browser/BUILD.gn

extensions/browser/app_window/app_window.cc

 // Copyright 2014 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 "extensions/browser/app_window/app_window.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <string>
@@ skipping 830 matching lines @@
     const GURL& image_url,
     const std::vector<SkBitmap>& bitmaps,
     const std::vector<gfx::Size>& original_bitmap_sizes) {
   if (((image_url != app_icon_url_) && (image_url != window_icon_url_)) ||
       bitmaps.empty()) {
     return;
   }
 
   // Bitmaps are ordered largest to smallest. Choose the smallest bitmap
   // whose height >= the preferred size.
-  int largest_index = 0;
+  size_t largest_index = 0;
   for (size_t i = 1; i < bitmaps.size(); ++i) {
     if (bitmaps[i].height() < app_delegate_->PreferredIconSize())
       break;
     largest_index = i;
   }
   const SkBitmap& largest = bitmaps[largest_index];
   UpdateAppIcon(gfx::Image::CreateFrom1xBitmap(largest));
 }
 
 void AppWindow::OnExtensionIconImageChanged(IconImage* image) {
@@ skipping 293 matching lines @@
         region.bounds.x(),
         region.bounds.y(),
         region.bounds.right(),
         region.bounds.bottom(),
         region.draggable ? SkRegion::kUnion_Op : SkRegion::kDifference_Op);
   }
   return sk_region;
 }
 
 }  // namespace extensions