Revert of Migrates battery_status from content/renderer/ to WebKit/platform/

Revert of Migrates battery_status from content/renderer/ to WebKit/platform/ (patchset #52 id:1070001 of https://codereview.chromium.org/1538803002/ )

Reason for revert:
Breaking bots.
https://bugs.chromium.org/p/chromium/issues/detail?id=589949

Original issue's description:
> Migrates battery_status from content/renderer/ to WebKit/platform/
> 
> As an effort to simplify the codebase after the repogitory
> merge of Blink into Chromium, we no longer need to put
> battery_status in content/renderer/.  Thus, migrates it to
> WebKit/Source/platform/.
> 
> * Files under WebKit/Source/platform/battery/ are
> intentionally written in Chromium's coding style so that
> it's easy to follow the diff.
> 
> * There is a plan to rewrite the mock service of battery
> status for layout tests based on JS-bindings of Mojo.
> (c.f. http://crrev.com/1472693004 )
> 
> BUG=561879
> NOPRESUBMIT=true
> 
> Committed: https://crrev.com/0d152ad4f21edf77ac5b585fcd8e6d05f1aae162
> Cr-Commit-Position: refs/heads/master@{#377586}

TBR=tkent@chromium.org,amistry@chromium.org,darin@chromium.org,esprehn@chromium.org,haraken@chromium.org,jam@chromium.org,kinuko@chromium.org,rockot@chromium.org,sammc@chromium.org,tzik@chromium.org,yzshen@chromium.org,yukishiino@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=561879

[agrieve, 2016-02-25 20:34:15]

Created Revert of Migrates battery_status from content/renderer/ to
WebKit/platform/

[commit-bot: I haz the power, 2016-02-25 20:37:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1740843002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1740843002/1

[jam, 2016-02-25 20:40:02]

The CQ bit was unchecked by jam@chromium.org

[commit-bot: I haz the power, 2016-02-25 20:41:06]

The CQ bit was unchecked by commit-bot@chromium.org

[jam, 2016-02-25 20:43:38]

per comment in original cl, i'll try to fix it