Move ownership of AppSorting from ExtensionPrefs to ExtensionSystem

extensions/browser/extension_prefs_factory.cc

Index: extensions/browser/extension_prefs_factory.cc
diff --git a/extensions/browser/extension_prefs_factory.cc b/extensions/browser/extension_prefs_factory.cc
index 5908000e5c2bb06a3b443c836b4123b75d4c470c..e52d4ea204bb4c14bd453c3076070615aade08e9 100644
--- a/extensions/browser/extension_prefs_factory.cc
+++ b/extensions/browser/extension_prefs_factory.cc
@@ -51,7 +51,6 @@ KeyedService* ExtensionPrefsFactory::BuildServiceInstanceFor(
       client->GetPrefServiceForContext(context),
       context->GetPath().AppendASCII(extensions::kInstallDirectoryName),
       ExtensionPrefValueMapFactory::GetForBrowserContext(context),

[Marc Treib, 2015/07/29 09:53:32]

It'd be nice if we could just pass in the AppSorting here, but it doesn't exist
yet at this point. The AppSortingFactory (which this would then DependsOn())
would solve that.

-      client->CreateAppSorting(context).Pass(),
       client->AreExtensionsDisabled(*base::CommandLine::ForCurrentProcess(),
                                     context),
       prefs_observers);