Plumb invalidations from Tango to the extensions code for the Push Messaging API.

chrome/browser/extensions/extension_system.cc

Index: chrome/browser/extensions/extension_system.cc
diff --git a/chrome/browser/extensions/extension_system.cc b/chrome/browser/extensions/extension_system.cc
index 086d2eff8ca5ac0670b986fc7d23cf9d5ec9d256..8c7c39d05f90386862183762d3972f570a0fb897 100644
--- a/chrome/browser/extensions/extension_system.cc
+++ b/chrome/browser/extensions/extension_system.cc
@@ -191,6 +191,11 @@ void ExtensionSystemImpl::Shared::Init(bool extensions_enabled) {
   }
 }
 
+void ExtensionSystemImpl::Shared::Shutdown() {
+  if (extension_service_.get())
+    extension_service_->Shutdown();
+}
+
 StateStore* ExtensionSystemImpl::Shared::state_store() {
   return state_store_.get();
 }