GitLab

Convert metadata_cache_item_unittest.js to be closure compiled.

- Remove html file that is not auto generated.
- Fix closure errors in the unittest file.

As MetadataCacheItem requires a MetadataItem to be a parameter most of the unit
test code needed to be re-written to use this type.

No change in behaviour.

Bug: 906919
Change-Id: Id903f8bec90abfa5256acb45d5eb3c3640d31acb
Reviewed-on: https://chromium-review.googlesource.com/c/1343413
Commit-Queue: Noel Gordon <noel@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609603}