Don't show the apps page on the NTP if the app launcher is installed.

chrome/browser/ui/webui/ntp/app_launcher_handler.h

Index: chrome/browser/ui/webui/ntp/app_launcher_handler.h
diff --git a/chrome/browser/ui/webui/ntp/app_launcher_handler.h b/chrome/browser/ui/webui/ntp/app_launcher_handler.h
index c68a176ecace1cfc5b772f8c320638ef6c33546c..2294e3b6982644abc7650caa6e4b22d8c385fdda 100644
--- a/chrome/browser/ui/webui/ntp/app_launcher_handler.h
+++ b/chrome/browser/ui/webui/ntp/app_launcher_handler.h
@@ -31,6 +31,24 @@ namespace extensions {
 class AppNotification;
 }
 
+class AppsPagePresenceHandler : public content::WebUIMessageHandler {

[Evan Stade, 2013/01/23 23:34:24]

why is this separate from AppLauncherHandler?

[jeremya, 2013/01/24 02:40:04]

Because AppLauncherHandler isn't always present. Previously this was required
because if the NTP didn't receive the gotShouldShowApps message it wouldn't
load, but since it loads opportunistically now, this can probably be rolled into
AppLauncherHandler.

+ public:
+  AppsPagePresenceHandler();
+  virtual ~AppsPagePresenceHandler();
+
+  // WebUIMessageHandler implementation.
+  virtual void RegisterMessages() OVERRIDE;
+
+  // Callback for the "getShouldShowApps" message.
+  void HandleGetShouldShowApps(const base::ListValue* args);
+
+ private:
+  // Callback for extensions::GetIsAppLauncherEnabled().
+  void GotIsAppLauncherEnabled(bool is_enabled);
+
+  DISALLOW_COPY_AND_ASSIGN(AppsPagePresenceHandler);
+};
+
 // The handler for Javascript messages related to the "apps" view.
 class AppLauncherHandler : public content::WebUIMessageHandler,
                            public ExtensionUninstallDialog::Delegate,