Remove ExtensionPrefs's dependency on ChromeAppSorting.

chrome/browser/extensions/chrome_extensions_browser_client.cc

Index: chrome/browser/extensions/chrome_extensions_browser_client.cc
diff --git a/chrome/browser/extensions/chrome_extensions_browser_client.cc b/chrome/browser/extensions/chrome_extensions_browser_client.cc
index cdcccfb884c6df3fc820932bf593b30e8fb53775..1cbc1d84150772cf1b8a8cc034fccc07e76872fa 100644
--- a/chrome/browser/extensions/chrome_extensions_browser_client.cc
+++ b/chrome/browser/extensions/chrome_extensions_browser_client.cc
@@ -7,6 +7,7 @@
 #include "base/command_line.h"
 #include "base/version.h"
 #include "chrome/browser/browser_process.h"
+#include "chrome/browser/extensions/chrome_app_sorting.h"
 #include "chrome/browser/extensions/extension_prefs.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
@@ -113,6 +114,10 @@ bool ChromeExtensionsBrowserClient::DidVersionUpdate(
   return last_version.IsOlderThan(current_version);
 }
 
+scoped_ptr<AppSorting> ChromeExtensionsBrowserClient::CreateAppSorting() {
+  return scoped_ptr<AppSorting>(new ChromeAppSorting()).Pass();
+}
+
 // static
 ChromeExtensionsBrowserClient* ChromeExtensionsBrowserClient::GetInstance() {
   return g_client.Pointer();