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

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

Index: chrome/browser/ui/webui/ntp/app_launcher_handler.cc
diff --git a/chrome/browser/ui/webui/ntp/app_launcher_handler.cc b/chrome/browser/ui/webui/ntp/app_launcher_handler.cc
index 37776021fd2801686dd4a596748d8782ea1aff32..fbb53c1ac5177d779d1b18cd6be382ce9f163083 100644
--- a/chrome/browser/ui/webui/ntp/app_launcher_handler.cc
+++ b/chrome/browser/ui/webui/ntp/app_launcher_handler.cc
@@ -14,6 +14,7 @@
 #include "base/metrics/histogram.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
+#include "chrome/browser/extensions/app_launcher.h"
 #include "chrome/browser/extensions/app_notification.h"
 #include "chrome/browser/extensions/app_notification_manager.h"
 #include "chrome/browser/extensions/crx_installer.h"
@@ -178,6 +179,9 @@ void AppLauncherHandler::RegisterMessages() {
   registrar_.Add(this, chrome::NOTIFICATION_APP_INSTALLED_TO_NTP,
       content::Source<WebContents>(web_ui()->GetWebContents()));
 
+  web_ui()->RegisterMessageCallback("getShouldShowApps",
+      base::Bind(&AppLauncherHandler::HandleGetShouldShowApps,
+                 base::Unretained(this)));
   web_ui()->RegisterMessageCallback("getApps",
       base::Bind(&AppLauncherHandler::HandleGetApps,
                  base::Unretained(this)));
@@ -390,6 +394,17 @@ DictionaryValue* AppLauncherHandler::GetAppInfo(const Extension* extension) {
   return app_info;
 }
 
+void AppLauncherHandler::HandleGetShouldShowApps(const ListValue* args) {
+  extensions::UpdateIsAppLauncherEnabled(
+      base::Bind(&AppLauncherHandler::GotIsAppLauncherEnabled,
+                 base::Unretained(this)));

[Evan Stade, 2013/01/24 18:40:17]

this doesn't seem right. You need to pass a weak pointer.

[jeremya, 2013/01/25 00:06:19]

Done.

+}
+
+void AppLauncherHandler::GotIsAppLauncherEnabled(bool is_enabled) {
+  base::FundamentalValue should_show_apps(!is_enabled);
+  web_ui()->CallJavascriptFunction("ntp.gotShouldShowApps", should_show_apps);
+}
+
 void AppLauncherHandler::HandleGetApps(const ListValue* args) {
   DictionaryValue dictionary;