Make the Remove Extension dialog modal for win app list.

chrome/browser/ui/ash/app_list/app_list_service_ash.cc

Index: chrome/browser/ui/ash/app_list/app_list_service_ash.cc
diff --git a/chrome/browser/ui/ash/app_list/app_list_service_ash.cc b/chrome/browser/ui/ash/app_list/app_list_service_ash.cc
index c9dfc571e6c90c20b2bf18b20958296c5ff7055d..64ad3fee8b96f539ce71bfd2320e3f15d529e124 100644
--- a/chrome/browser/ui/ash/app_list/app_list_service_ash.cc
+++ b/chrome/browser/ui/ash/app_list/app_list_service_ash.cc
@@ -32,6 +32,7 @@ class AppListServiceAsh : public AppListServiceImpl {
   virtual bool IsAppListVisible() const OVERRIDE;
   virtual void DismissAppList() OVERRIDE;
   virtual void EnableAppList() OVERRIDE;
+  virtual gfx::NativeWindow GetAppListWindow() OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(AppListServiceAsh);
 };
@@ -60,6 +61,12 @@ void AppListServiceAsh::DismissAppList() {
 
 void AppListServiceAsh::EnableAppList() {}
 
+gfx::NativeWindow AppListServiceAsh::GetAppListWindow() {
+  if (ash::Shell::HasInstance())
+    return ash::Shell::GetInstance()->GetAppListWindow();
+  return NULL;
+}
+
 }  // namespace
 
 namespace chrome {