maint(sdk): remove unused variable

Removes an unused variable and function from the SDK.

.changeset/cold-mangos-explain.md

+---
+'@eth-optimism/sdk': patch
+---
+
+Removes an unused variable from the SDK

packages/sdk/src/cross-chain-messenger.ts

@@ -116,11 +116,6 @@ export class CrossChainMessenger {
    */
   public bedrock: boolean
 
-  /**
-   * Parameters for the L2OutputOracle contract.
-   */
-  private _l2OutputOracleParameters: L2OutputOracleParameters
-
   /**
    * Creates a new CrossChainProvider instance.
    *
@@ -228,42 +223,6 @@ export class CrossChainMessenger {
     }
   }
 
-  /**
-   * Accesses the L2OutputOracle parameters, with caching to avoid unnecessary requests.
-   *
-   * @returns The L2OutputOracle parameters.
-   */
-  public async getL2OutputOracleParameters(): Promise<L2OutputOracleParameters> {
-    if (this._l2OutputOracleParameters) {
-      return this._l2OutputOracleParameters
-    }
-
-    // Temporary logic to support legacy Bedrock testnets.
-    // TODO: Remove this once all legacy testnets are deprecated.
-    let startingBlockNumber: number
-    try {
-      startingBlockNumber = (
-        await this.contracts.l1.L2OutputOracle.startingBlockNumber()
-      ).toNumber()
-    } catch {
-      startingBlockNumber = (
-        await this.contracts.l1.L2OutputOracle.STARTING_BLOCK_NUMBER()
-      ).toNumber()
-    }
-
-    this._l2OutputOracleParameters = {
-      startingBlockNumber,
-      submissionInterval: (
-        await this.contracts.l1.L2OutputOracle.SUBMISSION_INTERVAL()
-      ).toNumber(),
-      l2BlockTime: (
-        await this.contracts.l1.L2OutputOracle.L2_BLOCK_TIME()
-      ).toNumber(),
-    }
-
-    return this._l2OutputOracleParameters
-  }
-
   /**
    * Retrieves all cross chain messages sent within a given transaction.
    *