Refactor extension handling code from AppShimHost into ExtensionAppShimHandler.

chrome/browser/ui/app_list/app_list_service_mac_browsertest.mm

Index: chrome/browser/ui/app_list/app_list_service_mac_browsertest.mm
diff --git a/chrome/browser/ui/app_list/app_list_service_mac_browsertest.mm b/chrome/browser/ui/app_list/app_list_service_mac_browsertest.mm
index f8c18ef6c9dc45d2af4142ded64421de366a033d..4f7aee73845b8d45409be31ee48194e5d785219e 100644
--- a/chrome/browser/ui/app_list/app_list_service_mac_browsertest.mm
+++ b/chrome/browser/ui/app_list/app_list_service_mac_browsertest.mm
@@ -40,11 +40,17 @@ class AppListServiceMacBrowserTest : public InProcessBrowserTest,
     AppShimHandler::GetForAppMode(app_mode::kAppListModeId)->OnShimClose(this);
   }
 
-  // AppShimHandler::Host override:
+  // AppShimHandler::Host overrides:
   virtual void OnAppClosed() OVERRIDE {
     ++close_count_;
     QuitShim();
   }
+  virtual Profile* GetProfile() const OVERRIDE {
+    return NULL;  // Currently unused in this test.
+  }
+  virtual std::string GetAppId() const OVERRIDE {
+    return app_mode::kAppListModeId;
+  }
 
   int close_count_;
   bool running_;