Don't use NTP for app install if NTP does not show apps page.

chrome/browser/extensions/extension_install_ui.cc

Index: chrome/browser/extensions/extension_install_ui.cc
diff --git a/chrome/browser/extensions/extension_install_ui.cc b/chrome/browser/extensions/extension_install_ui.cc
index 8052ecb36bf6168a7d356a0ed292156fc8d0ed7b..839db07025d2b4f4cef6a6042511bbec15854adb 100644
--- a/chrome/browser/extensions/extension_install_ui.cc
+++ b/chrome/browser/extensions/extension_install_ui.cc
@@ -28,6 +28,7 @@
 #include "chrome/browser/ui/browser_navigator.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
+#include "chrome/browser/ui/webui/ntp/new_tab_ui.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension.h"
@@ -298,7 +299,9 @@ void ExtensionInstallUI::OnInstallSuccess(const Extension* extension,
                          cmdline->HasSwitch(switches::kAppsNewInstallBubble));
 #endif
 
-  if (extension->is_app() && !use_bubble_for_apps) {
+  if (extension->is_app() &&
+      !use_bubble_for_apps &&
+      NewTabUI::ShouldShowAppsPage()) {
     ExtensionInstallUI::OpenAppInstalledNTP(browser, extension->id());
     return;
   }