Revert of [Sensors] Align sensor reading updates and 'onchange' notification with rAF. (patchset #6 id:140001 of https://codereview.chromium.org/2551223003/ )

Reason for revert:
Seems like a likely cause for failures on:

https://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=sensor%2Faccelerometer.html&testType=webkit_tests

Original issue's description:
> [Sensors] Align sensor reading updates and 'onchange' notification with rAF.
>
> For all sensors new reading values are read and 'onchange' notfication is send from rAF callbacks, thus avoiding possible Critical Rendering Path interruption.
>
> Before this change a timers were used and this could unnecessarily drain CPU and battery.
>
> BUG=668052
> BUG=606766
>
> Committed: https://crrev.com/6b071fe7dc3bd64a2914eadd5c67b483d064a6cb
> Cr-Commit-Position: refs/heads/master@{#439467}

TBR=reillyg@chromium.org,alexander.shalamov@intel.com,haraken@chromium.org,foolip@chromium.org,mikhail.pozdnyakov@intel.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=668052

Review-Url: https://codereview.chromium.org/2590513002
Cr-Commit-Position: refs/heads/master@{#439487}
12 files changed