Remove static initializer from AppListView::SetNextPaintCallback().

ui/app_list/views/app_list_view.cc

Index: ui/app_list/views/app_list_view.cc
diff --git a/ui/app_list/views/app_list_view.cc b/ui/app_list/views/app_list_view.cc
index 0f6d2df219b6a74b8dfc82da80e82142ea70964b..fdf4f966140d1ba1b87752982f3bd97ef8d19afc 100644
--- a/ui/app_list/views/app_list_view.cc
+++ b/ui/app_list/views/app_list_view.cc
@@ -38,7 +38,7 @@ namespace app_list {
 
 namespace {
 
-base::Closure g_next_paint_callback;
+void (*g_next_paint_callback)();
 
 // The distance between the arrow tip and edge of the anchor view.
 const int kArrowOffset = 10;
@@ -126,9 +126,9 @@ gfx::Size AppListView::GetPreferredSize() {
 
 void AppListView::Paint(gfx::Canvas* canvas) {
   views::BubbleDelegateView::Paint(canvas);
-  if (!g_next_paint_callback.is_null()) {
-    g_next_paint_callback.Run();
-    g_next_paint_callback.Reset();
+  if (!g_next_paint_callback) {
+    g_next_paint_callback();
+    g_next_paint_callback = NULL;
   }
 }
 
@@ -159,7 +159,7 @@ void AppListView::RemoveObserver(Observer* observer) {
 }
 
 // static
-void AppListView::SetNextPaintCallback(const base::Closure& callback) {
+void AppListView::SetNextPaintCallback(void (*callback)()) {
   g_next_paint_callback = callback;
 }