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

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

Index: chrome/browser/ui/webui/ntp/new_tab_page_handler.h
diff --git a/chrome/browser/ui/webui/ntp/new_tab_page_handler.h b/chrome/browser/ui/webui/ntp/new_tab_page_handler.h
index 9db1182b29ac50043398a08fffad0b3b0ca524fa..34cc843949a55e76f64fd92bb6441f6c1f94be21 100644
--- a/chrome/browser/ui/webui/ntp/new_tab_page_handler.h
+++ b/chrome/browser/ui/webui/ntp/new_tab_page_handler.h
@@ -5,6 +5,7 @@
 #ifndef CHROME_BROWSER_UI_WEBUI_NTP_NEW_TAB_PAGE_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_NTP_NEW_TAB_PAGE_HANDLER_H_
 
+#include "base/memory/weak_ptr.h"
 #include "base/values.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "content/public/browser/web_ui_message_handler.h"
@@ -15,7 +16,8 @@ class Profile;
 
 // Handler for general New Tab Page functionality that does not belong in a
 // more specialized handler.
-class NewTabPageHandler : public content::WebUIMessageHandler {
+class NewTabPageHandler : public content::WebUIMessageHandler,
+                          public base::SupportsWeakPtr<NewTabPageHandler> {
  public:
   NewTabPageHandler();
 
@@ -55,6 +57,12 @@ class NewTabPageHandler : public content::WebUIMessageHandler {
   // Callback for "logTimeToClick".
   void HandleLogTimeToClick(const base::ListValue* args);
 
+  // Callback for the "getShouldShowApps" message.
+  void HandleGetShouldShowApps(const base::ListValue* args);
+
+  // Callback from extensions::UpdateIsAppLauncherEnabled().
+  void GotIsAppLauncherEnabled(bool is_enabled);
+
   // Tracks the number of times the user has switches pages (for UMA).
   size_t page_switch_count_;