[Extensions] Remove the prompt to re-enable app when visiting its site

chrome/browser/extensions/extension_system_impl.cc

Index: chrome/browser/extensions/extension_system_impl.cc
diff --git a/chrome/browser/extensions/extension_system_impl.cc b/chrome/browser/extensions/extension_system_impl.cc
index 59e2426554257a7a14ee4e65e4bbf0708e77086e..c1d75b2305412a4e8a689f5cf0aa832ffde182b7 100644
--- a/chrome/browser/extensions/extension_system_impl.cc
+++ b/chrome/browser/extensions/extension_system_impl.cc
@@ -27,7 +27,6 @@
 #include "chrome/browser/extensions/extension_system_factory.h"
 #include "chrome/browser/extensions/extension_util.h"
 #include "chrome/browser/extensions/install_verifier.h"
-#include "chrome/browser/extensions/navigation_observer.h"
 #include "chrome/browser/extensions/shared_module_service.h"
 #include "chrome/browser/extensions/shared_user_script_master.h"
 #include "chrome/browser/extensions/state_store_notification_observer.h"
@@ -185,8 +184,6 @@ void ExtensionSystemImpl::Shared::Init(bool extensions_enabled) {
   const base::CommandLine* command_line =
       base::CommandLine::ForCurrentProcess();
 
-  navigation_observer_.reset(new NavigationObserver(profile_));
-
   bool allow_noisy_errors = !command_line->HasSwitch(switches::kNoErrorDialogs);
   ExtensionErrorReporter::Init(allow_noisy_errors);