[Password Manager] Add UMA stats for custom passphrase users.

components/password_manager/core/browser/password_store_default.h

Index: components/password_manager/core/browser/password_store_default.h
diff --git a/components/password_manager/core/browser/password_store_default.h b/components/password_manager/core/browser/password_store_default.h
index f60183f0fac8e2ebc3b085ddc62ba015335a60ea..da866e2296f2a13bb1fb7b3131cfb251d6e92967 100644
--- a/components/password_manager/core/browser/password_store_default.h
+++ b/components/password_manager/core/browser/password_store_default.h
@@ -27,7 +27,7 @@ class PasswordStoreDefault : public PasswordStore {
   virtual ~PasswordStoreDefault();
 
   // Implements PasswordStore interface.
-  virtual void ReportMetricsImpl(const std::string& sync_username) override;
+  virtual void ReportMetricsImpl(PasswordManagerClient* client) override;
   virtual PasswordStoreChangeList AddLoginImpl(
       const autofill::PasswordForm& form) override;
   virtual PasswordStoreChangeList UpdateLoginImpl(