Fix unitialized pointer in RulesRegistryService.

chrome/browser/extensions/api/declarative/rules_registry_service.cc

Index: chrome/browser/extensions/api/declarative/rules_registry_service.cc
diff --git a/chrome/browser/extensions/api/declarative/rules_registry_service.cc b/chrome/browser/extensions/api/declarative/rules_registry_service.cc
index bede8418ae2e269512b31b8c93a855b493ba9e28..a767011bfa41f2cafd40eba697bc542ca4d146a5 100644
--- a/chrome/browser/extensions/api/declarative/rules_registry_service.cc
+++ b/chrome/browser/extensions/api/declarative/rules_registry_service.cc
@@ -33,7 +33,8 @@ void RegisterToExtensionWebRequestEventRouterOnIO(
 }  // namespace
 
 RulesRegistryService::RulesRegistryService(Profile* profile)
-    : profile_(profile) {
+    : content_rules_registry_(NULL),
+      profile_(profile) {
   if (profile) {
     registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_UNLOADED,
         content::Source<Profile>(profile->GetOriginalProfile()));