arc: Handle default app not availble case.

chrome/browser/ui/app_list/arc/arc_default_app_list.h

Index: chrome/browser/ui/app_list/arc/arc_default_app_list.h
diff --git a/chrome/browser/ui/app_list/arc/arc_default_app_list.h b/chrome/browser/ui/app_list/arc/arc_default_app_list.h
index 9b1f511cb8f461c5f4dbf4ae31f5bce0dd8bbe6c..566fc36c8d69be398bfb14507c99bca605ed08a8 100644
--- a/chrome/browser/ui/app_list/arc/arc_default_app_list.h
+++ b/chrome/browser/ui/app_list/arc/arc_default_app_list.h
@@ -10,6 +10,7 @@
 #include <map>
 #include <memory>
 #include <string>
+#include <unordered_set>
 
 #include "base/files/file_path.h"
 #include "base/macros.h"
@@ -67,6 +68,9 @@ class ArcDefaultAppList {
   void MaybeMarkPackageUninstalled(const std::string& package_name,
                                    bool uninstalled);
 
+  // Returns set of packages which are marked not as uninstalled.
+  std::unordered_set<std::string> GetActivePackages() const;
+
   const AppInfoMap& app_map() const { return apps_; }
 
   // Marks default apps as hidden for user, for example in case Arc is managed
@@ -76,7 +80,7 @@ class ArcDefaultAppList {
 
  private:
   // Defines mapping package name to uninstalled state.
-  using PacakageMap = std::map<std::string, bool>;
+  using PackageMap = std::map<std::string, bool>;
 
   // Called when default apps are read.
   void OnAppsReady(std::unique_ptr<AppInfoMap> apps);
@@ -87,7 +91,7 @@ class ArcDefaultAppList {
   bool hidden_ = true;
 
   AppInfoMap apps_;
-  PacakageMap packages_;
+  PackageMap packages_;
 
   base::WeakPtrFactory<ArcDefaultAppList> weak_ptr_factory_;