Cleanup many APIs to use ProfileKeyedAPI.

chrome/browser/extensions/api/sync_file_system/extension_sync_event_observer.cc

Index: chrome/browser/extensions/api/sync_file_system/extension_sync_event_observer.cc
diff --git a/chrome/browser/extensions/api/sync_file_system/extension_sync_event_observer.cc b/chrome/browser/extensions/api/sync_file_system/extension_sync_event_observer.cc
index c5fe516a0038c7c38eb3772f64a83c11f50cf513..5772895150a06f4986f00aa492e0a1428aa65cc7 100644
--- a/chrome/browser/extensions/api/sync_file_system/extension_sync_event_observer.cc
+++ b/chrome/browser/extensions/api/sync_file_system/extension_sync_event_observer.cc
@@ -4,16 +4,20 @@
 
 #include "chrome/browser/extensions/api/sync_file_system/extension_sync_event_observer.h"
 
+#include "base/lazy_instance.h"
 #include "chrome/browser/extensions/api/sync_file_system/sync_file_system_api_helpers.h"
 #include "chrome/browser/extensions/event_names.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sync_file_system/sync_event_observer.h"
 #include "chrome/browser/sync_file_system/sync_file_system_service.h"
+#include "chrome/browser/sync_file_system/sync_file_system_service_factory.h"
 #include "chrome/browser/sync_file_system/syncable_file_system_util.h"
 #include "chrome/common/extensions/api/sync_file_system.h"
 #include "extensions/browser/event_router.h"
 #include "extensions/browser/extension_system.h"
+#include "extensions/browser/extension_system_provider.h"
+#include "extensions/browser/extensions_browser_client.h"
 #include "webkit/browser/fileapi/file_system_url.h"
 #include "webkit/common/fileapi/file_system_util.h"
 
@@ -21,6 +25,15 @@ using sync_file_system::SyncEventObserver;
 
 namespace extensions {
 
+static base::LazyInstance<ProfileKeyedAPIFactory<ExtensionSyncEventObserver> >
+    g_factory = LAZY_INSTANCE_INITIALIZER;
+
+// static
+ProfileKeyedAPIFactory<ExtensionSyncEventObserver>*
+ExtensionSyncEventObserver::GetFactoryInstance() {
+  return g_factory.Pointer();
+}
+
 ExtensionSyncEventObserver::ExtensionSyncEventObserver(
     Profile* profile)
     : profile_(profile),
@@ -126,4 +139,11 @@ void ExtensionSyncEventObserver::BroadcastOrDispatchEvent(
   event_router->DispatchEventToExtension(extension_id, event.Pass());
 }
 
+template <>
+void ProfileKeyedAPIFactory<
+    ExtensionSyncEventObserver>::DeclareFactoryDependencies() {
+  DependsOn(sync_file_system::SyncFileSystemServiceFactory::GetInstance());
+  DependsOn(ExtensionsBrowserClient::Get()->GetExtensionSystemFactory());
+}
+
 }  // namespace extensions