[wasm] Fix stupid arguments.

TBR=machenbach@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1772593002 .

Cr-Commit-Position: refs/heads/master@{#34524}

test/mjsunit/wasm/test-wasm-module-builder.js

@@ -7,8 +7,6 @@
 load('test/mjsunit/wasm/wasm-constants.js');
 load('test/mjsunit/wasm/wasm-module-builder.js');
 
-var debug = (((typeof arguments) != undefined) && arguments[0] == "debug");
-
 (function BasicTest() {
     var module = new WasmModuleBuilder();
     module.addMemory(1, 2, false);