Make --install-chrome-app use extensions::WebstoreInstallWithPrompt.

chrome/browser/ui/startup/startup_browser_creator_impl.cc

Index: chrome/browser/ui/startup/startup_browser_creator_impl.cc
diff --git a/chrome/browser/ui/startup/startup_browser_creator_impl.cc b/chrome/browser/ui/startup/startup_browser_creator_impl.cc
index 794dcb164e8b5f935081cb567078d8df9e12cb91..cc89d3756779b9872c084533b707c5cceb41c80c 100644
--- a/chrome/browser/ui/startup/startup_browser_creator_impl.cc
+++ b/chrome/browser/ui/startup/startup_browser_creator_impl.cc
@@ -24,7 +24,6 @@
 #include "base/strings/string_split.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_restrictions.h"
-#include "chrome/browser/apps/install_chrome_app.h"
 #include "chrome/browser/auto_launch_trial.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
@@ -373,11 +372,6 @@ bool StartupBrowserCreatorImpl::Launch(Profile* profile,
 
     ProcessLaunchURLs(process_startup, urls_to_open, desktop_type);
 
-    if (command_line_.HasSwitch(switches::kInstallChromeApp)) {
-      install_chrome_app::InstallChromeApp(
-          command_line_.GetSwitchValueASCII(switches::kInstallChromeApp));
-    }
-
     // If this is an app launch, but we didn't open an app window, it may
     // be an app tab.
     OpenApplicationTab(profile);