[MD settings] observe changes to default font size in Appearance

[MD settings] observe changes to default font size in Appearance

This CL updates the fixed font size from the Appearance section reliably.
(It was previously working depending on which settings page had been
visited).

Also, updates the UI to remove the font size on the example of the fixed
font size.

BUG=671562
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2817243003
Cr-Commit-Position: refs/heads/master@{#465054}
(cherry picked from commit b7cd6a5130a7a261ae997c5e37dc4fec4560cff3)

Review-Url: https://codereview.chromium.org/2830883002 .
Cr-Commit-Position: refs/branch-heads/3071@{#64}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed: https://chromium.googlesource.com/chromium/src/+/f0f4366ae4a82c833071ef05f4bc72503119c0af

[dschuyler, 2017-04-19 20:32:06]

Description was changed from

==========
[MD settings] observe changes to default font size in Appearance

This CL updates the fixed font size from the Appearance section reliably.
(It was previously working depending on which settings page had been
visited).

Also, updates the UI to remove the font size on the example of the fixed
font size.

BUG=671562
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2817243003
Cr-Commit-Position: refs/heads/master@{#465054}
(cherry picked from commit b7cd6a5130a7a261ae997c5e37dc4fec4560cff3)
==========

to

==========
[MD settings] observe changes to default font size in Appearance

This CL updates the fixed font size from the Appearance section reliably.
(It was previously working depending on which settings page had been
visited).

Also, updates the UI to remove the font size on the example of the fixed
font size.

BUG=671562
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2817243003
Cr-Commit-Position: refs/heads/master@{#465054}
(cherry picked from commit b7cd6a5130a7a261ae997c5e37dc4fec4560cff3)

Review-Url: https://codereview.chromium.org/2830883002 .
Cr-Commit-Position: refs/branch-heads/3071@{#64}
Cr-Branched-From:
a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed:
https://chromium.googlesource.com/chromium/src/+/f0f4366ae4a82c833071ef05f4bc...
==========

[dschuyler, 2017-04-19 20:32:07]

Committed patchset #1 (id:1) manually as
f0f4366ae4a82c833071ef05f4bc72503119c0af.