Implement debugging local unlock keys in chrome://proximity-auth.

components/proximity_auth/client_impl.h

Index: components/proximity_auth/client_impl.h
diff --git a/components/proximity_auth/client_impl.h b/components/proximity_auth/client_impl.h
index d04609240a0b48edffbb265e03ce0534ac0b1cd6..11582c91a2da0948fa8347f196eb4dbe80d10c18 100644
--- a/components/proximity_auth/client_impl.h
+++ b/components/proximity_auth/client_impl.h
@@ -42,9 +42,10 @@ class ClientImpl : public Client, public ConnectionObserver {
   void RequestDecryption(const std::string& challenge) override;
   void RequestUnlock() override;
 
- protected:
   // Exposed for testing.
   Connection* connection() { return connection_.get(); }
+
+ protected:
   SecureContext* secure_context() { return secure_context_.get(); }
 
  private: