HID report descriptors not available before OS X 10.8.

HID report descriptors not available before OS X 10.8.

On OS X Snow Leopard and Lion (currently supported by Chrome) the
kIOHIDReportDescriptorKey is not available as it is in later versions of
the operating system. Since we are also unable to get the device's
report descriptor on Windows it seems okay to just ignore the failure.

BUG=479210
Committed: https://crrev.com/7015dfbf9a232ef20022454986d3bd251b12b824
Cr-Commit-Position: refs/heads/master@{#351183}

[Reilly Grant (use Gerrit), 2015-09-28 21:48:02]

reillyg@chromium.org changed reviewers:
+ juncai@chromium.org

[Reilly Grant (use Gerrit), 2015-09-28 21:48:02]

Please take a look.

[juncai, 2015-09-28 21:55:58]

lgtm

[Reilly Grant (use Gerrit), 2015-09-28 21:56:23]

The CQ bit was checked by reillyg@chromium.org

[commit-bot: I haz the power, 2015-09-28 21:57:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1373923003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1373923003/1

[commit-bot: I haz the power, 2015-09-28 22:45:20]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-28 22:46:57]

Patchset 1 (id:??) landed as
https://crrev.com/7015dfbf9a232ef20022454986d3bd251b12b824
Cr-Commit-Position: refs/heads/master@{#351183}