Don't allow font scale to be lower than 1.0

Don't allow font scale to be lower than 1.0

Many people who're using lower font scale do not expect this behavior, so
Let's revert this (logically) for now, and consider a solution for
low scale font if necessary.

BUG=687770, 646254
Review-Url: https://codereview.chromium.org/2680393002
Cr-Commit-Position: refs/heads/master@{#449124}
(cherry picked from commit 4ef351aa3467a587e03d8d19cdd9f280ab8fff4d)

Review-Url: https://codereview.chromium.org/2680933007 .
Cr-Commit-Position: refs/branch-heads/2987@{#423}
Cr-Branched-From: ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed: https://chromium.googlesource.com/chromium/src/+/8d5792c797a0850cefd3e1d6169caf2c390b97c9

[oshima, 2017-02-09 23:59:58]

Description was changed from

==========
Don't allow font scale to be lower than 1.0

Many people who're using lower font scale do not expect this behavior, so
Let's revert this (logically) for now, and consider a solution for
low scale font if necessary.

BUG=687770,646254

Review-Url: https://codereview.chromium.org/2680393002
Cr-Commit-Position: refs/heads/master@{#449124}
(cherry picked from commit 4ef351aa3467a587e03d8d19cdd9f280ab8fff4d)
==========

to

==========
Don't allow font scale to be lower than 1.0

Many people who're using lower font scale do not expect this behavior, so
Let's revert this (logically) for now, and consider a solution for
low scale font if necessary.

BUG=687770,646254

Review-Url: https://codereview.chromium.org/2680393002
Cr-Commit-Position: refs/heads/master@{#449124}
(cherry picked from commit 4ef351aa3467a587e03d8d19cdd9f280ab8fff4d)

Review-Url: https://codereview.chromium.org/2680933007 .
Cr-Commit-Position: refs/branch-heads/2987@{#423}
Cr-Branched-From:
ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed:
https://chromium.googlesource.com/chromium/src/+/8d5792c797a0850cefd3e1d6169c...
==========

[oshima, 2017-02-09 23:59:59]

Committed patchset #3 (id:40001) manually as
8d5792c797a0850cefd3e1d6169caf2c390b97c9.