M59: WebUI: Fix calculation of md-select text and arrow spacing.

M59: WebUI: Fix calculation of md-select text and arrow spacing.

Previous calculation was not properly taking into account the position of
the arrow. New calculation ensures that there is always some white space
between the arrow and the text.

BUG=693698, 710802
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2825403003
Cr-Commit-Position: refs/heads/master@{#465800}
(cherry picked from commit 25e4011a30bc7e0cbb2912ea1fe47defefa606f8)

Review-Url: https://codereview.chromium.org/2836763002 .
Cr-Commit-Position: refs/branch-heads/3071@{#138}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed: https://chromium.googlesource.com/chromium/src/+/6eb1222c5a221fc570b5a2cee9e418c496a3b55a

[Lei Zhang, 2017-04-21 23:57:25]

Description was changed from

==========
M59: WebUI: Fix calculation of md-select text and arrow spacing.

Previous calculation was not properly taking into account the position of
the arrow. New calculation ensures that there is always some white space
between the arrow and the text.

BUG=693698,710802
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2825403003
Cr-Commit-Position: refs/heads/master@{#465800}
(cherry picked from commit 25e4011a30bc7e0cbb2912ea1fe47defefa606f8)
==========

to

==========
M59: WebUI: Fix calculation of md-select text and arrow spacing.

Previous calculation was not properly taking into account the position of
the arrow. New calculation ensures that there is always some white space
between the arrow and the text.

BUG=693698,710802
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2825403003
Cr-Commit-Position: refs/heads/master@{#465800}
(cherry picked from commit 25e4011a30bc7e0cbb2912ea1fe47defefa606f8)

Review-Url: https://codereview.chromium.org/2836763002 .
Cr-Commit-Position: refs/branch-heads/3071@{#138}
Cr-Branched-From:
a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed:
https://chromium.googlesource.com/chromium/src/+/6eb1222c5a221fc570b5a2cee9e4...
==========

[Lei Zhang, 2017-04-21 23:57:26]

Committed patchset #1 (id:1) manually as
6eb1222c5a221fc570b5a2cee9e418c496a3b55a.

[dpapad, 2017-04-21 23:58:00]

dpapad@chromium.org changed reviewers:
+ dpapad@chromium.org

[dpapad, 2017-04-21 23:58:01]

LGTM stamp (the diff looks identical to the original CL).