contracts-bedrock: use interface IL2ToL2CrossDomainMessenger for L2To…

…L2CrossDomainMessenger.sol

packages/contracts-bedrock/src/L2/L2ToL2CrossDomainMessenger.sol

@@ -5,14 +5,15 @@ import { CrossL2Inbox } from "src/L2/CrossL2Inbox.sol";
 import { Encoding } from "src/libraries/Encoding.sol";
 import { Predeploys } from "src/libraries/Predeploys.sol";
 import { ISemver } from "src/universal/ISemver.sol";
+import { IL2ToL2CrossDomainMessenger } from "src/L2/IL2ToL2CrossDomainMessenger.sol";
 
 /// @custom:proxied
 /// @custom:predeploy 0x4200000000000000000000000000000000000023
 /// @title L2ToL2CrossDomainMessenger
 /// @notice The L2ToL2CrossDomainMessenger is a higher level abstraction on top of the CrossL2Inbox that provides
 ///         features necessary for secure transfers ERC20 tokens between L2 chains. Messages sent through the
 ///         L2ToL2CrossDomainMessenger on the source chain receive both replay protection as well as domain binding.
-contract L2ToL2CrossDomainMessenger is ISemver {
+contract L2ToL2CrossDomainMessenger is IL2ToL2CrossDomainMessenger, ISemver {
     /// @notice Storage slot for the sender of the current cross domain message.
     ///         Equal to bytes32(uint256(keccak256("l2tol2crossdomainmessenger.sender")) - 1)
     bytes32 public constant CROSS_DOMAIN_MESSAGE_SENDER_SLOT =