Fix line breaks in autocomplete-information attribute

If you have an <input> element with a placeholder like below:

  <input placeholder="a
  b">

the autocomplete-information attribute does not correctly reflect this:

  <input placeholder="a
  b"
autofill-information="overall type: UNKNOWN_TYPE
server type: NO_SERVER_DATA
heuristic type: UNKNOWN_TYPE
label: a
  b
parseable name:
..."

The label:-line contains part of the placeholder and the next line
contains unparseable information.

After the fix, the autocomplete-information attribute is rendered as

  <input placeholder="a
  b"
autofill-information="overall type: UNKNOWN_TYPE
server type: NO_SERVER_DATA
heuristic type: UNKNOWN_TYPE
label: a|  b
parseable name:
..."

This is better when trying to parse the autocomplete-information attribute.

Bug: 1511681
Change-Id: Ibab1eb7797739d572875999e933673a6d13be54e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5123131
Commit-Queue: Norge Vizcay <vizcay@google.com>
Reviewed-by: Norge Vizcay <vizcay@google.com>
Auto-Submit: Dominic Battre <battre@chromium.org>
Commit-Queue: Dominic Battre <battre@chromium.org>
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1237682}