Cleanup: Pull some browser keep alive functions into its own file.

chrome/browser/guest_view/app_view/chrome_app_view_guest_delegate.cc

Index: chrome/browser/guest_view/app_view/chrome_app_view_guest_delegate.cc
diff --git a/chrome/browser/guest_view/app_view/chrome_app_view_guest_delegate.cc b/chrome/browser/guest_view/app_view/chrome_app_view_guest_delegate.cc
index 071d448fad821c079b4eca487038103fbb3086e7..e945131727a08833dae72abbc568bd0762a5950f 100644
--- a/chrome/browser/guest_view/app_view/chrome_app_view_guest_delegate.cc
+++ b/chrome/browser/guest_view/app_view/chrome_app_view_guest_delegate.cc
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "chrome/browser/apps/scoped_keep_alive.h"
 #include "chrome/browser/guest_view/app_view/chrome_app_view_guest_delegate.h"
+#include "chrome/browser/lifetime/browser_keep_alive.h"
 #include "chrome/browser/renderer_context_menu/render_view_context_menu.h"
 #include "chrome/browser/ui/apps/chrome_app_delegate.h"
 #include "components/renderer_context_menu/context_menu_delegate.h"
@@ -30,7 +30,8 @@ bool ChromeAppViewGuestDelegate::HandleContextMenu(
 }
 
 AppDelegate* ChromeAppViewGuestDelegate::CreateAppDelegate() {
-  return new ChromeAppDelegate(make_scoped_ptr(new ScopedKeepAlive));
+  return new ChromeAppDelegate(
+      make_scoped_ptr(new browser_lifetime::ScopedKeepAlive));
 }
 
 }  // namespace extensions