Convert //components/proximity_auth from scoped_ptr to std::unique_ptr

components/proximity_auth/fake_connection.h

Index: components/proximity_auth/fake_connection.h
diff --git a/components/proximity_auth/fake_connection.h b/components/proximity_auth/fake_connection.h
index 4e873c0e3ae015de14e8041265b4b08c2a3710b7..c525d4fb36972163f0d1027d3cacdb8b22307246 100644
--- a/components/proximity_auth/fake_connection.h
+++ b/components/proximity_auth/fake_connection.h
@@ -34,13 +34,13 @@ class FakeConnection : public Connection {
 
  private:
   // Connection:
-  void SendMessageImpl(scoped_ptr<WireMessage> message) override;
-  scoped_ptr<WireMessage> DeserializeWireMessage(
+  void SendMessageImpl(std::unique_ptr<WireMessage> message) override;
+  std::unique_ptr<WireMessage> DeserializeWireMessage(
       bool* is_incomplete_message) override;
 
   // The message currently being sent. Only set between a call to
   // SendMessageImpl() and FinishSendingMessageWithSuccess().
-  scoped_ptr<WireMessage> current_message_;
+  std::unique_ptr<WireMessage> current_message_;
 
   // The payload that should be returned when DeserializeWireMessage() is
   // called.