Rename AccountId method GetGaiaIdKey() to GetAccountIdKey().

components/signin/core/account_id/account_id.h

Index: components/signin/core/account_id/account_id.h
diff --git a/components/signin/core/account_id/account_id.h b/components/signin/core/account_id/account_id.h
index fe567d4ff621ec6fce81cdc22b005b095f33ceff..061733c950f07c401e7b33097d2ca4a785347306 100644
--- a/components/signin/core/account_id/account_id.h
+++ b/components/signin/core/account_id/account_id.h
@@ -36,7 +36,7 @@ class AccountId {
   const std::string& GetUserEmail() const;
 
   // This returns prefixed GaiaId string to be used as a storage key.

[Roger Tawa OOO till Jul 10th, 2016/10/26 18:32:20]

This comment is misleading.  Users of AccountId should make no assumptions about
the format of the account id, gaia id, and email address.  They should treat the
three as non-decomposable and non-comparable strings.

[Alexander Alekseev, 2016/10/27 05:02:22]

I was about to delay updating of comments to the future changes, but you're
right. Earlier is always better. ;)

Done.

-  const std::string GetGaiaIdKey() const;
+  const std::string GetAccountIdKey() const;
 
   void SetGaiaId(const std::string& gaia_id);
   void SetUserEmail(const std::string& email);