Fix serial device PID and VID parsing

Fix serial device PID and VID parsing

Serial device's PID and VID contain hex digits, this patch
fixed the code which parses it by adding "a-fA-F" to the
regular expression.

BUG=599101
Review URL: https://codereview.chromium.org/1848963002

Cr-Commit-Position: refs/heads/master@{#384414}
(cherry picked from commit 66ecade99de4820622281ce4a17e511a4b6aa404)

Committed: https://chromium.googlesource.com/chromium/src/+/ad10ef75e16235786db5f9d5346523870a6b8777

[juncai, 2016-04-01 23:01:16]

Description was changed from

==========
Fix serial device PID and VID parsing

Serial device's PID and VID contain hex digits, this patch
fixed the code which parses it by adding "a-fA-F" to the
regular expression.

BUG=599101

Review URL: https://codereview.chromium.org/1848963002

Cr-Commit-Position: refs/heads/master@{#384414}
(cherry picked from commit 66ecade99de4820622281ce4a17e511a4b6aa404)
==========

to

==========
Fix serial device PID and VID parsing

Serial device's PID and VID contain hex digits, this patch
fixed the code which parses it by adding "a-fA-F" to the
regular expression.

BUG=599101

Review URL: https://codereview.chromium.org/1848963002

Cr-Commit-Position: refs/heads/master@{#384414}
(cherry picked from commit 66ecade99de4820622281ce4a17e511a4b6aa404)

Committed:
https://chromium.googlesource.com/chromium/src/+/ad10ef75e16235786db5f9d53465...
==========

[juncai, 2016-04-01 23:01:17]

Committed patchset #1 (id:1) manually as
ad10ef75e16235786db5f9d5346523870a6b8777 (tree was closed).