contacts: Rename provider_id to contact_id.

chrome/browser/chromeos/contacts/contact_store.h

Index: chrome/browser/chromeos/contacts/contact_store.h
diff --git a/chrome/browser/chromeos/contacts/contact_store.h b/chrome/browser/chromeos/contacts/contact_store.h
index d0277ecd4a79ccaa5e0f28c75cb0c2aa17893761..d9de02756fd3731bdc1e7bd3a62591f4f9f3ca40 100644
--- a/chrome/browser/chromeos/contacts/contact_store.h
+++ b/chrome/browser/chromeos/contacts/contact_store.h
@@ -30,10 +30,9 @@ class ContactStore {
   // Appends all (non-deleted) contacts to |contacts_out|.
   virtual void AppendContacts(ContactPointers* contacts_out) = 0;
 
-  // Returns the contact identified by |provider_id|.
+  // Returns the contact identified by |contact_id|.
   // NULL is returned if the contact doesn't exist.
-  virtual const Contact* GetContactByProviderId(
-      const std::string& provider_id) = 0;
+  virtual const Contact* GetContactById(const std::string& contact_id) = 0;
 
   // Adds or removes an observer.
   virtual void AddObserver(ContactStoreObserver* observer) = 0;