chromeos: Fix interface nits.

chrome/browser/chromeos/contacts/contact_database.h

Index: chrome/browser/chromeos/contacts/contact_database.h
diff --git a/chrome/browser/chromeos/contacts/contact_database.h b/chrome/browser/chromeos/contacts/contact_database.h
index 963f61d6ffd0eaee6c182cb92def03b9ae355423..e74e7ef05e8d9d1faae2892093d7bf5c3ac4f450 100644
--- a/chrome/browser/chromeos/contacts/contact_database.h
+++ b/chrome/browser/chromeos/contacts/contact_database.h
@@ -42,8 +42,6 @@ class ContactDatabaseInterface {
                               scoped_ptr<UpdateMetadata>)>
       LoadCallback;
 
-  ContactDatabaseInterface() {}
-
   // Asynchronously destroys the object after all in-progress file operations
   // have completed.
   virtual void DestroyOnUIThread() {}
@@ -70,9 +68,6 @@ class ContactDatabaseInterface {
 
  protected:
   virtual ~ContactDatabaseInterface() {}
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(ContactDatabaseInterface);
 };
 
 class ContactDatabase : public ContactDatabaseInterface {