contacts: Add ContactManagerInterface::GetWeakPtr().

chrome/browser/chromeos/contacts/contact_manager_stub.h

Index: chrome/browser/chromeos/contacts/contact_manager_stub.h
diff --git a/chrome/browser/chromeos/contacts/contact_manager_stub.h b/chrome/browser/chromeos/contacts/contact_manager_stub.h
index 817d64db0f81efda4a21118244076caf58333230..340374073b20be56799c63013f88e5f22bb14bd9 100644
--- a/chrome/browser/chromeos/contacts/contact_manager_stub.h
+++ b/chrome/browser/chromeos/contacts/contact_manager_stub.h
@@ -25,6 +25,7 @@ class ContactManagerStub : public ContactManagerInterface {
   void NotifyObserversAboutUpdatedContacts();
 
   // ContactManagerInterface overrides:
+  virtual base::WeakPtr<ContactManagerInterface> GetWeakPtr() OVERRIDE;
   virtual void AddObserver(ContactManagerObserver* observer, Profile* profile)
       OVERRIDE;
   virtual void RemoveObserver(ContactManagerObserver* observer,
@@ -44,6 +45,10 @@ class ContactManagerStub : public ContactManagerInterface {
   // Contacts that will be returned by GetAllContacts() and GetContactById().
   ScopedVector<Contact> contacts_;
 
+  // Note: This should remain the last member so it'll be destroyed and
+  // invalidate its weak pointers before any other members are destroyed.
+  base::WeakPtrFactory<ContactManagerInterface> weak_ptr_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(ContactManagerStub);
 };