Purge the App Launcher code from Windows.

ash/shell/app_list.cc

Index: ash/shell/app_list.cc
diff --git a/ash/shell/app_list.cc b/ash/shell/app_list.cc
index e4a066a33b7cf868d9d267d171765e0bcaf5e8da..a4342c26b7355eca913c87c318ce1b96a40e236c 100644
--- a/ash/shell/app_list.cc
+++ b/ash/shell/app_list.cc
@@ -249,12 +249,6 @@ class ExampleAppListViewDelegate : public app_list::AppListViewDelegate {
 
   app_list::SpeechUIModel* GetSpeechUI() override { return &speech_ui_; }
 
-  void GetShortcutPathForApp(
-      const std::string& app_id,
-      const base::Callback<void(const base::FilePath&)>& callback) override {
-    callback.Run(base::FilePath());
-  }
-
   void OpenSearchResult(app_list::SearchResult* result,
                         bool auto_launch,
                         int event_flags) override {