This reverts commit e866f043cf.
Reason for revert: Breaks google3.
Original change's description:
> [dartdevc] cleaning up unused web files
>
> Dependent on these google3 changes: https://critique.corp.google.com/#review/272749649
>
> Change-Id: I9e89142cd5b2a619acfc35badb9cf3c549b3be9c
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/119587
> Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
> Commit-Queue: Mark Zhou <markzipan@google.com>
TBR=scheglov@google.com,vsm@google.com,markzipan@google.com
Change-Id: I1db094d94d699d4d18c4091f57c7cb775eb95dd5
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/120040
Reviewed-by: David Morgan <davidmorgan@google.com>
Commit-Queue: David Morgan <davidmorgan@google.com>
d6c6d12ebf