Instant: Use only one hidden WebContents per profile.

chrome/browser/instant/instant_service_factory.cc

Index: chrome/browser/instant/instant_service_factory.cc
diff --git a/chrome/browser/instant/instant_service_factory.cc b/chrome/browser/instant/instant_service_factory.cc
index 0edac14686ddb537fbbecdb626a5f02f35179043..bea3e6d37ca71fe4be61ddb55710b9554b180768 100644
--- a/chrome/browser/instant/instant_service_factory.cc
+++ b/chrome/browser/instant/instant_service_factory.cc
@@ -6,6 +6,8 @@
 
 #include "chrome/browser/instant/instant_service.h"
 #include "chrome/browser/profiles/profile_dependency_manager.h"
+#include "chrome/browser/search_engines/template_url_service_factory.h"
+#include "chrome/browser/themes/theme_service_factory.h"
 
 // static
 InstantService* InstantServiceFactory::GetForProfile(Profile* profile) {
@@ -21,7 +23,8 @@ InstantServiceFactory* InstantServiceFactory::GetInstance() {
 InstantServiceFactory::InstantServiceFactory()
     : ProfileKeyedServiceFactory("InstantService",
                                  ProfileDependencyManager::GetInstance()) {
-  // No dependencies.
+  DependsOn(TemplateURLServiceFactory::GetInstance());
+  DependsOn(ThemeServiceFactory::GetInstance());
 }
 
 InstantServiceFactory::~InstantServiceFactory() {