Create a ManagedModeNavigationObserver only for managed users.

chrome/browser/ui/browser_tab_contents.cc

Index: chrome/browser/ui/browser_tab_contents.cc
diff --git a/chrome/browser/ui/browser_tab_contents.cc b/chrome/browser/ui/browser_tab_contents.cc
index fdcaa16fa2609e12afe354deaec94950d49e7186..1ab5caed4b56f8f5de5732b5ac60cf891c7cec9b 100644
--- a/chrome/browser/ui/browser_tab_contents.cc
+++ b/chrome/browser/ui/browser_tab_contents.cc
@@ -57,6 +57,11 @@
 #include "chrome/browser/captive_portal/captive_portal_tab_helper.h"
 #endif
 
+#if defined(ENABLE_MANAGED_USERS)
+#include "chrome/browser/managed_mode/managed_user_service.h"
+#include "chrome/browser/managed_mode/managed_user_service_factory.h"
+#endif
+
 #if defined(ENABLE_PRINTING)
 #include "chrome/browser/printing/print_preview_message_handler.h"
 #include "chrome/browser/printing/print_view_manager.h"
@@ -131,7 +136,6 @@ void BrowserTabContents::AttachTabHelpers(WebContents* web_contents) {
   HistoryTabHelper::CreateForWebContents(web_contents);
   HungPluginTabHelper::CreateForWebContents(web_contents);
   InfoBarService::CreateForWebContents(web_contents);
-  ManagedModeNavigationObserver::CreateForWebContents(web_contents);
   NavigationMetricsRecorder::CreateForWebContents(web_contents);
   if (OmniboxSearchHint::IsEnabled(profile))
     OmniboxSearchHint::CreateForWebContents(web_contents);
@@ -161,6 +165,13 @@ void BrowserTabContents::AttachTabHelpers(WebContents* web_contents) {
   captive_portal::CaptivePortalTabHelper::CreateForWebContents(web_contents);
 #endif
 
+#if defined(ENABLE_MANAGED_USERS)
+  ManagedUserService* service =
+      ManagedUserServiceFactory::GetForProfile(profile);
+  if (service->ProfileIsManaged())
+    ManagedModeNavigationObserver::CreateForWebContents(web_contents);
+#endif
+
 #if defined(ENABLE_PRINTING)
   printing::PrintPreviewMessageHandler::CreateForWebContents(web_contents);
   printing::PrintViewManager::CreateForWebContents(web_contents);