Replace "external_install" boolean parameter with explicit enumeration in ExtensionUninstall method.

chrome/browser/ui/views/extensions/bookmark_app_bubble_view.cc

Index: chrome/browser/ui/views/extensions/bookmark_app_bubble_view.cc
diff --git a/chrome/browser/ui/views/extensions/bookmark_app_bubble_view.cc b/chrome/browser/ui/views/extensions/bookmark_app_bubble_view.cc
index b6c32eb892f889075febc49ec18dc618cbee01c6..af80b9362605310040918765be0c70f6476808f0 100644
--- a/chrome/browser/ui/views/extensions/bookmark_app_bubble_view.cc
+++ b/chrome/browser/ui/views/extensions/bookmark_app_bubble_view.cc
@@ -197,7 +197,7 @@ void BookmarkAppBubbleView::WindowClosing() {
 
   if (remove_app_) {
     profile_->GetExtensionService()->UninstallExtension(
-        extension_id_, false, NULL);
+        extension_id_, ExtensionService::kUninstallReasonDefault, NULL);
   } else {
     ApplyEdits();
   }