ScalingFitlerInterpreter: Don't depend on device class

This way, a change in the xorg.conf file about whether a device is a
mouse or touchpad will take effect.

This is needed b/c the ThinkPad Compact Keyboard shows up a touch
device (crazy, I know).

BUG=chromium:430319
TEST=Manually tested scrolling and pointer movement. No regressions in
regression test suite.

Change-Id: Id0ffe193cf8ca1a883b81dd5072f87858bb3e75b
Reviewed-on: https://chromium-review.googlesource.com/228298
Reviewed-by: Dennis Kempin <denniskempin@chromium.org>
Tested-by: Andrew de los Reyes <adlr@chromium.org>
Commit-Queue: Andrew de los Reyes <adlr@chromium.org>
2 files changed