Remove DomFeatureParsing histogram

This histogram was added to debug a non-issue (I had misread the release
schedule). The features parse successfully, every time, so the histogram
isn't useful.

Bug: 979387
Change-Id: I7a2ece4144b6bea66166d5ab5fcb205fae0f1adf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1758505
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#687805}
2 files changed