CL at https://codereview.chromium.org/2788853003/

Before and after shots (no changes).

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	Screenshot from 2017-03-31 15:46:43.png 11.2 KB View Download

New after screen shot, showing the grey separator line again (so now, no changes).

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The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ae7fc3094d50f04c513f4b62c5f45475cbba17f5

commit ae7fc3094d50f04c513f4b62c5f45475cbba17f5
Author: dschuyler <dschuyler@chromium.org>
Date: Mon Apr 03 20:59:08 2017

[MD settings] clickable toggle labels on category default toggles

This CL makes top level category default rows react to mouse clicks.
These are the one or two rows at the top of a content settings category
(such as "cookies"). The rows are toggles. Before this CL the labels on
the toggles wouldn't act on mouse clicks when they should.

Also, there are several name changes and tiddying up that could be in a
separate CL if that is preferred.

BUG= 704003 
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2788853003
Cr-Commit-Position: refs/heads/master@{#461533}

[modify] https://crrev.com/ae7fc3094d50f04c513f4b62c5f45475cbba17f5/chrome/browser/resources/settings/site_settings/category_default_setting.html
[modify] https://crrev.com/ae7fc3094d50f04c513f4b62c5f45475cbba17f5/chrome/browser/resources/settings/site_settings/category_default_setting.js