Revert of Improve canonicalization of mailto url path components (patchset #2 id:20001 of https://codereview.chromium.org/2817213002/ )

Reason for revert:
appears to be breaking fast/url/mailto.html on at least the Mac bots:
https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.10/builds/32726
https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.12/builds/1614
https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.9/builds/45169

diffs:
-PASS canonicalize('mailto:addr1, addr2') is 'mailto:addr1, addr2'
+FAIL canonicalize('mailto:addr1, addr2') should be mailto:addr1, addr2. Was mailto:addr1,%20addr2.

Original issue's description:
> Improve canonicalization of mailto url path components
>
> The canonicalization of the path component of mailto urls is too lax, leading to
> information disclosure and possible command injection attacks against mail
> clients. To fix this, we will percent-encode more characters in the path
> component of mailto urls, matching other browsers.
>
> BUG=711020
> TEST=url_unittests
>
> Review-Url: https://codereview.chromium.org/2817213002
> Cr-Commit-Position: refs/heads/master@{#465046}
> Committed: https://chromium.googlesource.com/chromium/src/+/484ff36cdcb8dcf5efa999a471d1d509c0a8a5f2

TBR=brettw@chromium.org,elawrence@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=711020

Review-Url: https://codereview.chromium.org/2823883005
Cr-Commit-Position: refs/heads/master@{#465063}
2 files changed