Instant: Use only one hidden WebContents per profile.

chrome/browser/profiles/profile_dependency_manager.cc

Index: chrome/browser/profiles/profile_dependency_manager.cc
diff --git a/chrome/browser/profiles/profile_dependency_manager.cc b/chrome/browser/profiles/profile_dependency_manager.cc
index abd2a29a361d76568d39c8db5c70f8d9358313f2..9b4084323b2def9ce1d64a2dd98727f91163ba40 100644
--- a/chrome/browser/profiles/profile_dependency_manager.cc
+++ b/chrome/browser/profiles/profile_dependency_manager.cc
@@ -54,6 +54,7 @@
 #include "chrome/browser/google/google_url_tracker_factory.h"
 #include "chrome/browser/history/history_service_factory.h"
 #include "chrome/browser/history/shortcuts_backend_factory.h"
+#include "chrome/browser/instant/instant_service_factory.h"
 #include "chrome/browser/media_galleries/media_galleries_preferences_factory.h"
 #include "chrome/browser/notifications/desktop_notification_service_factory.h"
 #if !defined(OS_ANDROID)
@@ -324,6 +325,7 @@ void ProfileDependencyManager::AssertFactoriesBuilt() {
   GlobalErrorServiceFactory::GetInstance();
   GoogleURLTrackerFactory::GetInstance();
   HistoryServiceFactory::GetInstance();
+  InstantServiceFactory::GetInstance();
 #if !defined(OS_ANDROID)
   notifier::ChromeNotifierServiceFactory::GetInstance();
 #endif