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According to the URL specification [1], several parts of a parsed url
must UTF-8 percent-encoded supersets of the C0 control percent encode
set [2]. However, Blink does not do that for U+007F DELETE in the
cannot-be-a-base-URL path and fragment states [3] [4]. This CL fixes
that and also adds URL WPT tests for various URL percent-encoding
cases.

You can find more details on the Chrome status entry [5] and
intent-to-ship thread [6].

[1] https://url.spec.whatwg.org/#concept-basic-url-parser
[2] https://url.spec.whatwg.org/#c0-control-percent-encode-set
[3] https://url.spec.whatwg.org/#cannot-be-a-base-url-path-state
[4] https://url.spec.whatwg.org/#fragment-state
[5] https://chromestatus.com/feature/5651438652882944
[6] https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/en6buycTcKQ

Bug: 809852
Change-Id: I9c75224a537f09a5b41ca7e9295f2a3bf7fad061
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2324425Reviewed-by: Mike West <mkwst@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Frédéric Wang <fwang@igalia.com>
Cr-Commit-Position: refs/heads/master@{#796734}