Remove command line flag to install an ephemeral app.

chrome/browser/extensions/startup_helper.h

Index: chrome/browser/extensions/startup_helper.h
diff --git a/chrome/browser/extensions/startup_helper.h b/chrome/browser/extensions/startup_helper.h
index c291e381d50809a9d04c8baf11b9baac182efd3a..82cc596101b62fa652396069d1953a7d113621e0 100644
--- a/chrome/browser/extensions/startup_helper.h
+++ b/chrome/browser/extensions/startup_helper.h
@@ -37,11 +37,6 @@ class StartupHelper : public PackExtensionJob::Client {
   // into |error|.
   bool ValidateCrx(const base::CommandLine& cmd_line, std::string* error);
 
-  // Handle --install-ephemeral-app-from-webstore flag from |cmd_line| by
-  // downloading metadata from the webstore for the given id, prompting the
-  // user to confirm, and then downloading the crx and installing it.
-  bool InstallEphemeralApp(const base::CommandLine& cmd_line, Profile* profile);
-
  private:
   scoped_refptr<PackExtensionJob> pack_job_;
   bool pack_job_succeeded_;