Removed DeviceDataManagerX11::scrollclass_devices_

Removed DeviceDataManagerX11::scrollclass_devices_

This field isn't needed, and goes against the idea that a mouse either supports
scroll classes entirely or not at all. Instead we should use logic that checks
whether a device supports horizontal, vertical or both scroll classes. I also
fixed some logic that could have passed an invalid validator ID into
XIMaskIsSet---this new check covers the check removed above it.

BUG=596013
Review URL: https://codereview.chromium.org/1896483002

Cr-Commit-Position: refs/heads/master@{#388208}
(cherry picked from commit b89e8ac7021fcee56c7cc34fd077eac253c99d0b)

Committed: https://chromium.googlesource.com/chromium/src/+/ef15254ebb53083a61667ea253372d690d61b125

[dtapuska, 2016-04-28 20:45:50]

Description was changed from

==========
Removed DeviceDataManagerX11::scrollclass_devices_

This field isn't needed, and goes against the idea that a mouse either supports
scroll classes entirely or not at all. Instead we should use logic that checks
whether a device supports horizontal, vertical or both scroll classes. I also
fixed some logic that could have passed an invalid validator ID into
XIMaskIsSet---this new check covers the check removed above it.

BUG=596013

Review URL: https://codereview.chromium.org/1896483002

Cr-Commit-Position: refs/heads/master@{#388208}
(cherry picked from commit b89e8ac7021fcee56c7cc34fd077eac253c99d0b)
==========

to

==========
Removed DeviceDataManagerX11::scrollclass_devices_

This field isn't needed, and goes against the idea that a mouse either supports
scroll classes entirely or not at all. Instead we should use logic that checks
whether a device supports horizontal, vertical or both scroll classes. I also
fixed some logic that could have passed an invalid validator ID into
XIMaskIsSet---this new check covers the check removed above it.

BUG=596013

Review URL: https://codereview.chromium.org/1896483002

Cr-Commit-Position: refs/heads/master@{#388208}
(cherry picked from commit b89e8ac7021fcee56c7cc34fd077eac253c99d0b)

Committed:
https://chromium.googlesource.com/chromium/src/+/ef15254ebb53083a61667ea25337...
==========

[dtapuska, 2016-04-28 20:45:51]

Committed patchset #1 (id:1) manually as
ef15254ebb53083a61667ea253372d690d61b125.