fix(ctb): remove unnecessary ERC20 factory code

Removes a legacy getter that was mistakenly added to the ERC20 factory.
We never had a getter for the bridge variable.

op-chain-ops/genesis/layer_one_test.go

@@ -84,7 +84,7 @@ func TestBuildL1DeveloperGenesis(t *testing.T) {
 
 	factory, err := bindings.NewOptimismMintableERC20(predeploys.DevOptimismMintableERC20FactoryAddr, sim)
 	require.NoError(t, err)
-	bridgeAddr, err := factory.Bridge(callOpts)
+	bridgeAddr, err := factory.BRIDGE(callOpts)
 	require.NoError(t, err)
 	require.Equal(t, predeploys.DevL1StandardBridgeAddr, bridgeAddr)
 

packages/contracts-bedrock/.gas-snapshot

@@ -226,10 +226,10 @@ OptimismMintableERC20_Test:test_legacy_succeeds() (gas: 14344)
 OptimismMintableERC20_Test:test_mint_notBridge_reverts() (gas: 11121)
 OptimismMintableERC20_Test:test_mint_succeeds() (gas: 63609)
 OptimismMintableERC20_Test:test_remoteToken_succeeds() (gas: 7622)
-OptimismMintableTokenFactory_Test:test_bridge_succeeds() (gas: 7577)
-OptimismMintableTokenFactory_Test:test_createStandardL2Token_remoteIsZero_succeeds() (gas: 9413)
-OptimismMintableTokenFactory_Test:test_createStandardL2Token_sameTwice_succeeds() (gas: 2176713)
-OptimismMintableTokenFactory_Test:test_createStandardL2Token_succeeds() (gas: 1095296)
+OptimismMintableTokenFactory_Test:test_bridge_succeeds() (gas: 7602)
+OptimismMintableTokenFactory_Test:test_createStandardL2Token_remoteIsZero_succeeds() (gas: 9390)
+OptimismMintableTokenFactory_Test:test_createStandardL2Token_sameTwice_succeeds() (gas: 2176667)
+OptimismMintableTokenFactory_Test:test_createStandardL2Token_succeeds() (gas: 1095273)
 OptimismMintableERC721_Test:test_burn_notBridge_reverts() (gas: 136922)
 OptimismMintableERC721_Test:test_burn_succeeds() (gas: 118779)
 OptimismMintableERC721_Test:test_constructor_succeeds() (gas: 24162)

packages/contracts-bedrock/contracts/test/OptimismMintableERC20Factory.t.sol

@@ -17,7 +17,7 @@ contract OptimismMintableTokenFactory_Test is Bridge_Initializer {
     }
 
     function test_bridge_succeeds() external {
-        assertEq(address(L2TokenFactory.bridge()), address(L2Bridge));
+        assertEq(address(L2TokenFactory.BRIDGE()), address(L2Bridge));
     }
 
     function test_createStandardL2Token_succeeds() external {

packages/contracts-bedrock/contracts/universal/OptimismMintableERC20Factory.sol

@@ -50,16 +50,6 @@ contract OptimismMintableERC20Factory is Semver {
         BRIDGE = _bridge;
     }
 
-    /**
-     * @custom:legacy
-     * @notice Legacy getter for StandardBridge address.
-     *
-     * @return Address of the StandardBridge on this chain.
-     */
-    function bridge() external view returns (address) {
-        return BRIDGE;
-    }
-
     /**
      * @custom:legacy
      * @notice Creates an instance of the OptimismMintableERC20 contract. Legacy version of the

packages/contracts-bedrock/deploy/021-SystemDictatorSteps-2.ts

@@ -264,7 +264,7 @@ const deployFn: DeployFunction = async (hre) => {
       // Check OptimismMintableERC20Factory was initialized properly.
       await assertContractVariable(
         OptimismMintableERC20Factory,
-        'bridge',
+        'BRIDGE',
         L1StandardBridge.address
       )