Decompose //extensions/browser/BUILD.gn

extensions/browser/app_window/app_window.cc

Index: extensions/browser/app_window/app_window.cc
diff --git a/extensions/browser/app_window/app_window.cc b/extensions/browser/app_window/app_window.cc
index 67c5019fed46c095e8be287eeb014e22f6758626..e059604dfcb569ceebc587879d042de849e42b07 100644
--- a/extensions/browser/app_window/app_window.cc
+++ b/extensions/browser/app_window/app_window.cc
@@ -848,7 +848,7 @@ void AppWindow::DidDownloadFavicon(
 
   // 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;