Remove the old stale copy of the spec and remove js/lodash.js which
is loaded in several places but not actually used for anything.

Bug: 782901
Change-Id: Idfdbc9f1cf2d9edf190d649168074f4d4ec66c73
Reviewed-on: https://chromium-review.googlesource.com/759225
Reviewed-by: Hongchan Choi <[email protected]>
Commit-Queue: Raymond Toy <[email protected]>
Cr-Commit-Position: refs/heads/master@{#515256}