Remove Increment/DecrementKeepAliveCount from AppsClient

extensions/browser/app_window/app_window_client.h

Index: extensions/browser/app_window/app_window_client.h
diff --git a/extensions/browser/app_window/app_window_client.h b/extensions/browser/app_window/app_window_client.h
index 985febf4088b312700891b008fa31804358dd274..82d0f4e07e003bfa394fff13f6eb46971ac7bfe5 100644
--- a/extensions/browser/app_window/app_window_client.h
+++ b/extensions/browser/app_window/app_window_client.h
@@ -40,11 +40,6 @@ class AppWindowClient {
       AppWindow* window,
       const AppWindow::CreateParams& params) = 0;
 
-  // A positive keep-alive count is a request for the embedding application to
-  // keep running after all windows are closed. The count starts at zero.
-  virtual void IncrementKeepAliveCount() = 0;
-  virtual void DecrementKeepAliveCount() = 0;
-
   // Opens DevTools window and runs the callback.
   virtual void OpenDevToolsWindow(content::WebContents* web_contents,
                                   const base::Closure& callback) = 0;