Move ownership of AppSorting from ExtensionPrefs to ExtensionSystem

extensions/browser/extensions_browser_client.h

Index: extensions/browser/extensions_browser_client.h
diff --git a/extensions/browser/extensions_browser_client.h b/extensions/browser/extensions_browser_client.h
index 672b9251de9252174a0fd3767da28eea22112a8e..82c78d42763f69cff58b397613a43d9382e95215 100644
--- a/extensions/browser/extensions_browser_client.h
+++ b/extensions/browser/extensions_browser_client.h
@@ -37,7 +37,6 @@ class URLRequestJob;
 namespace extensions {
 
 class ApiActivityMonitor;
-class AppSorting;
 class ComponentExtensionResourceManager;
 class Extension;
 class ExtensionCache;
@@ -161,10 +160,6 @@ class ExtensionsBrowserClient {
   // ExternalProtocolHandler::PermitLaunchUrl() in Chrome.
   virtual void PermitExternalProtocolHandler() = 0;
 
-  // Creates a new AppSorting instance.
-  virtual scoped_ptr<AppSorting> CreateAppSorting(
-      content::BrowserContext* context) = 0;
-
   // Return true if the system is run in forced app mode.
   virtual bool IsRunningInForcedAppMode() = 0;