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This reverts commit 42f6f938.

Reason for revert: 
1- We need to trigger event before reading
2- Reading one byte will make next reading unaligned.
3- The error was due to invalid group setting, fixed since.

Original change's description:
> Do not use the accelerometer device file when it's failed to read
>
> On some system / device configuration, the accelerometer device
> file exists but can't be read by the browser process. When this
> happens, it generates error log repeatedly, which is not great.
>
> This CL tries to address this issue in a way. On initializing
> accelerometer configuration, it tries to read the device file
> at that time, and when it fails to read, it just stops the
> initialization and reports an error message. This happens once,
> and does not generate repeated logs.
>
> Also, when an error happens, now it can obtain the errno and
> print it as a part of the log, so it would be more understandable
> why it fails. On my case, it is just permission denied, for some
> reasons.
>
> Bug: 1134527
> Test: manually with nautilus device in the lab
> Change-Id: Ib9823631a70fc54d3e3abc35067aff56a7d7ee50
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2454840
> Reviewed-by: Min Chen <minch@chromium.org>
> Reviewed-by: James Cook <jamescook@chromium.org>
> Commit-Queue: Jun Mukai <mukai@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#814780}

TBR=jamescook@chromium.org,mukai@chromium.org,minch@chromium.org,chenghaoyang@chromium.org

Change-Id: Icd2a780a14bd4e12358053f150a37bd3d7f46f75
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1134527,1133429
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2461648Reviewed-by: Jun Mukai <mukai@chromium.org>
Commit-Queue: Gwendal Grignou <gwendal@chromium.org>
Auto-Submit: Gwendal Grignou <gwendal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815187}