Revert of Mojo JS bindings: support auto-loading mojom.js deps. (patchset #3 id:40001 of https://codereview.chromium.org/2779493002/ )

Reason for revert:
It looks we have to revert this CL too in order to revert https://codereview.chromium.org/2759563004/.

The previous revert failed in: https://codereview.chromium.org/2779533002/

Original issue's description:
> Mojo JS bindings: support auto-loading mojom.js deps.
>
> It also adds a config to turn off this behavior.
>
> BUG=699569
>
> Review-Url: https://codereview.chromium.org/2779493002
> Cr-Commit-Position: refs/heads/master@{#459695}
> Committed: https://chromium.googlesource.com/chromium/src/+/e326a5d409dadb3df6811b3dca7f1cfecb4ef520

TBR=rockot@chromium.org,yzshen@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=699569

Review-Url: https://codereview.chromium.org/2777083002
Cr-Commit-Position: refs/heads/master@{#459724}
5 files changed