[node] check out wasm-js as a dependency

The dependency is not required to build V8 but Node.js needs it for
running mjsunit tests.

Refs: https://github.com/nodejs/node-v8/issues/83
Change-Id: Ieb37acb73e5e2fe417c7d9a16c498565839b7a45
Reviewed-on: https://chromium-review.googlesource.com/c/1278166Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56616}

tools/node/fetch_deps.py

@@ -32,7 +32,6 @@ GCLIENT_SOLUTION = [
       "v8/test/mozilla/data"                  : None,
       "v8/test/test262/data"                  : None,
       "v8/test/test262/harness"               : None,
-      "v8/test/wasm-js"                       : None,
       "v8/third_party/android_ndk"            : None,
       "v8/third_party/android_tools"          : None,
       "v8/third_party/catapult"               : None,