Removed dead code from chrome/browser/extensions/api/declarative

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

Index: chrome/browser/extensions/api/declarative/rules_registry_with_cache.cc
diff --git a/chrome/browser/extensions/api/declarative/rules_registry_with_cache.cc b/chrome/browser/extensions/api/declarative/rules_registry_with_cache.cc
index b95bc7c47a37a608fe846dc1f3633b3c4f617d1b..8949b46e848c20f88ac17305958f4e9392bf5730 100644
--- a/chrome/browser/extensions/api/declarative/rules_registry_with_cache.cc
+++ b/chrome/browser/extensions/api/declarative/rules_registry_with_cache.cc
@@ -20,10 +20,6 @@ RulesRegistryWithCache::RulesRegistryWithCache(Delegate* delegate)
     : delegate_(delegate) {
 }
 
-void RulesRegistryWithCache::AddReadyCallback(const base::Closure& callback) {
-  ready_callbacks_.push_back(callback);
-}
-
 void RulesRegistryWithCache::OnReady() {
   for (size_t i = 0; i < ready_callbacks_.size(); ++i)
     ready_callbacks_[i].Run();