Disable ephemeral apps after they stop running

chrome/browser/apps/ephemeral_app_launcher.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/apps/ephemeral_app_launcher.h"
 
 #include "base/command_line.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_install_checker.h"
 #include "chrome/browser/extensions/extension_install_prompt.h"
@@ skipping 206 matching lines @@
   if (!extensions::util::IsAppLaunchable(extension->id(), profile())) {
     *reason = webstore_install::REQUIREMENT_VIOLATIONS;
     *error = kRequirementsError;
     return false;
   }
 
   return true;
 }
 
 void EphemeralAppLauncher::EnableInstalledApp(const Extension* extension) {
+  // Keep this object alive until the enable flow is complete. Either
+  // ExtensionEnableFlowFinished() or ExtensionEnableFlowAborted() will be
+  // called.
+  AddRef();
+
   extension_enable_flow_.reset(
       new ExtensionEnableFlow(profile(), extension->id(), this));
   if (web_contents())
     extension_enable_flow_->StartForWebContents(web_contents());
   else
     extension_enable_flow_->StartForNativeWindow(parent_window_);
-
-  // Keep this object alive until the enable flow is complete. Either
-  // ExtensionEnableFlowFinished() or ExtensionEnableFlowAborted() will be
-  // called.
-  AddRef();
 }
 
 void EphemeralAppLauncher::MaybeLaunchApp() {
   webstore_install::Result result = webstore_install::UNKNOWN_ERROR;
   std::string error;
 
   ExtensionRegistry* registry = ExtensionRegistry::Get(profile());
   const Extension* extension =
       registry->GetExtensionById(id(), ExtensionRegistry::EVERYTHING);
   if (extension) {
@@ skipping 191 matching lines @@
 
 void EphemeralAppLauncher::ExtensionEnableFlowFinished() {
   MaybeLaunchApp();
   Release();  // Matches the AddRef in EnableInstalledApp().
 }
 
 void EphemeralAppLauncher::ExtensionEnableFlowAborted(bool user_initiated) {
   InvokeCallback(webstore_install::USER_CANCELLED, kUserCancelledError);
   Release();  // Matches the AddRef in EnableInstalledApp().
 }