Using the per-revision bisect providing the bisect results,
Good build: 58.0.3032.0 (Revision: 452713).
Bad build : 58.0.3033.0 (Revision: 453044).

You are probably looking for a change made after 452898 (known good), but no later than 452899 (first known bad).
CHANGELOG URL:
  https://chromium.googlesource.com/chromium/src/+log/f8de71db706d577e6f8e0407679277022af6c8d2..0fcdf64bf2b57cfc3c21965bd037d198f7fabd4e

@xiaochengh: Could you please look into the issue, pardon me if it has nothing to do with your changes and if possible please assign it to concern owner.
Thank You.

The CL in #1 fixes a bug that, text in <input> is not spellchecked if it ends with a letter.

chrome://md-settings/searchEngines (and possibly other pages?) should add spellcheck="false" to its input fields where spellchecking is unwanted.

Hence rerouting to Web UI team.

@dbeam, @tbuckley: The change at https://codereview.chromium.org/2712833004 causes a lot of our text inputs to be spellchecked (and annotated with red underlines), whereas before this was not happening.

Is this considered a bug? If so, should we fix this for M59? 

if you have to ask whether it's a bug, I'd say it's unlikely this is merge-worthy

i don't realllly see a huge problem with spellchecking too many inputs, but happy to turn it off as well in M60 if we don't want it.

 Issue 721325  has been merged into this issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/4dafa544f5e60db81cec06c308d1a2f4c3535226

commit 4dafa544f5e60db81cec06c308d1a2f4c3535226
Author: dpapad <dpapad@chromium.org>
Date: Tue Aug 15 20:31:46 2017

Settings WebUI: Turn off spellcheck on certain dialogs.

Stop spellchecking URLs and other non-free form text inputs.

Bug:  717875 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Iee9ac2024e8e7b96e3c57f7ab9973081fc8d3e3d
Reviewed-on: https://chromium-review.googlesource.com/611568
Reviewed-by: Dave Schuyler <dschuyler@chromium.org>
Commit-Queue: Dave Schuyler <dschuyler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#494524}
[modify] https://crrev.com/4dafa544f5e60db81cec06c308d1a2f4c3535226/chrome/browser/resources/settings/on_startup_page/startup_url_dialog.html
[modify] https://crrev.com/4dafa544f5e60db81cec06c308d1a2f4c3535226/chrome/browser/resources/settings/search_engines_page/search_engine_dialog.html
[modify] https://crrev.com/4dafa544f5e60db81cec06c308d1a2f4c3535226/chrome/browser/resources/settings/site_settings/add_site_dialog.html

Note: Retested the above issue on #62.0.3187.0 on Linux(14.04 LTS) and Win(7,8,10).
Fix is working as intended.