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

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

Index: chrome/browser/ui/webui/ntp/new_tab_page_handler.cc
diff --git a/chrome/browser/ui/webui/ntp/new_tab_page_handler.cc b/chrome/browser/ui/webui/ntp/new_tab_page_handler.cc
index 3600116fffe86ae38eaad4e28dcf58a5983bfd39..8416cfafce3f1f36a5a0bdaf84a68d47568e14ee 100644
--- a/chrome/browser/ui/webui/ntp/new_tab_page_handler.cc
+++ b/chrome/browser/ui/webui/ntp/new_tab_page_handler.cc
@@ -8,6 +8,7 @@
 #include "base/bind_helpers.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/histogram.h"
+#include "chrome/browser/extensions/app_launcher.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sync/profile_sync_service.h"
@@ -73,6 +74,9 @@ void NewTabPageHandler::RegisterMessages() {
   web_ui()->RegisterMessageCallback("logTimeToClick",
       base::Bind(&NewTabPageHandler::HandleLogTimeToClick,
                  base::Unretained(this)));
+  web_ui()->RegisterMessageCallback("getShouldShowApps",
+      base::Bind(&NewTabPageHandler::HandleGetShouldShowApps,
+                 base::Unretained(this)));
 }
 
 void NewTabPageHandler::HandleNotificationPromoClosed(const ListValue* args) {
@@ -167,6 +171,17 @@ void NewTabPageHandler::HandleLogTimeToClick(const ListValue* args) {
   }
 }
 
+void NewTabPageHandler::HandleGetShouldShowApps(const ListValue* args) {
+  extensions::UpdateIsAppLauncherEnabled(
+      base::Bind(&NewTabPageHandler::GotIsAppLauncherEnabled,
+                 AsWeakPtr()));
+}
+
+void NewTabPageHandler::GotIsAppLauncherEnabled(bool is_enabled) {
+  base::FundamentalValue should_show_apps(!is_enabled);
+  web_ui()->CallJavascriptFunction("ntp.gotShouldShowApps", should_show_apps);
+}
+
 // static
 void NewTabPageHandler::RegisterUserPrefs(PrefServiceSyncable* prefs) {
   // TODO(estade): should be syncable.