Remove profile-keyed factory boilerplates.

chrome/browser/extensions/api/bookmarks/bookmark_api.cc

Index: chrome/browser/extensions/api/bookmarks/bookmark_api.cc
diff --git a/chrome/browser/extensions/api/bookmarks/bookmark_api.cc b/chrome/browser/extensions/api/bookmarks/bookmark_api.cc
index c0768138e02e0e33d039ded8ef06624d692b1780..5ac5118169e4fcd8bc4e6b141a3b0461915b7881 100644
--- a/chrome/browser/extensions/api/bookmarks/bookmark_api.cc
+++ b/chrome/browser/extensions/api/bookmarks/bookmark_api.cc
@@ -9,6 +9,7 @@
 #include "base/i18n/file_util_icu.h"
 #include "base/i18n/time_formatting.h"
 #include "base/json/json_writer.h"
+#include "base/lazy_instance.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/path_service.h"
 #include "base/prefs/public/pref_service_base.h"
@@ -297,6 +298,14 @@ void BookmarkAPI::Shutdown() {
   ExtensionSystem::Get(profile_)->event_router()->UnregisterObserver(this);
 }
 
+static base::LazyInstance<ProfileKeyedAPIFactory<BookmarkAPI> >
+g_factory = LAZY_INSTANCE_INITIALIZER;
+
+// static
+ProfileKeyedAPIFactory<BookmarkAPI>* BookmarkAPI::GetFactoryInstance() {
+  return &g_factory.Get();
+}
+
 void BookmarkAPI::OnListenerAdded(const EventListenerInfo& details) {
   bookmark_event_router_.reset(new BookmarkEventRouter(
       BookmarkModelFactory::GetForProfile(profile_)));