Revert of [WebViewLayoutTest] Fix potential rounding error in testBatteryApi() layout test.

Revert of [WebViewLayoutTest] Fix potential rounding error in testBatteryApi() layout test. (patchset #1 id:1 of https://codereview.chromium.org/1394303007/ )

Reason for revert:
This patch caused WebViewLayoutTest#testBatteryApi to fail consistently on https://uberchromegw.corp.google.com/i/chromium.android/builders/Android%20Webview%20L%20%28dbg%29/builds/3317 onwards.

Original issue's description:
> [WebViewLayoutTest] Fix potential rounding error in testBatteryApi() layout test.
>
> The battery.level precision test isInteger(battery.level * 100) can
> occasionally fail due to rounding error,
> e.g. (0.58 * 100) % 1 = 0.9999999999999929.
> This patch uses toPrecision and toString methods instead to correct
> this issue.
>
> BUG=
>
> Committed: https://crrev.com/beebf8aac8acd93bd045d94a5835e12b4992176e
> Cr-Commit-Position: refs/heads/master@{#354498}

TBR=mvanouwerkerk@chromium.org,timvolodine@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Committed: https://crrev.com/c80ce31ead16f31e4f1693e782c23a1a24865ad8
Cr-Commit-Position: refs/heads/master@{#354510}

[johnme, 2015-10-16 14:00:49]

Created Revert of [WebViewLayoutTest] Fix potential rounding error in
testBatteryApi() layout test.

[commit-bot: I haz the power, 2015-10-16 14:00:57]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1406243002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1406243002/1

[commit-bot: I haz the power, 2015-10-16 14:01:32]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-16 14:03:15]

Patchset 1 (id:??) landed as
https://crrev.com/c80ce31ead16f31e4f1693e782c23a1a24865ad8
Cr-Commit-Position: refs/heads/master@{#354510}