Remove Profile-keyed factory boilerplate: cookies, managed_mode & web_navigation

chrome/browser/extensions/api/web_navigation/web_navigation_api.cc

Index: chrome/browser/extensions/api/web_navigation/web_navigation_api.cc
diff --git a/chrome/browser/extensions/api/web_navigation/web_navigation_api.cc b/chrome/browser/extensions/api/web_navigation/web_navigation_api.cc
index d3793821665fc0c7bf05ee94ce55070217e222f2..4855a0f21da36251461b6b31bbfa99c85f59e012 100644
--- a/chrome/browser/extensions/api/web_navigation/web_navigation_api.cc
+++ b/chrome/browser/extensions/api/web_navigation/web_navigation_api.cc
@@ -768,4 +768,13 @@ void WebNavigationAPI::OnListenerAdded(
   ExtensionSystem::Get(profile_)->event_router()->UnregisterObserver(this);
 }
 
+static base::LazyInstance<ProfileKeyedAPIFactory<WebNavigationAPI> >
+g_factory = LAZY_INSTANCE_INITIALIZER;
+
+template <>
+ProfileKeyedAPIFactory<WebNavigationAPI>*
+ProfileKeyedAPIFactory<WebNavigationAPI>::GetInstance() {
+  return &g_factory.Get();
+}
+
 }  // namespace extensions