Revert of [chromedriver] Add shadow DOM support to chromedriver.

Revert of [chromedriver] Add shadow DOM support to chromedriver. (patchset #4 id:60001 of https://codereview.chromium.org/480483002/)

Reason for revert:
This CL breaks ElementEqualityTest.testAnElementFoundInADifferentFrameViaJsShouldHaveSameId and ElementFindingTest.testAnElementFoundInADifferentFrameViaJsCanBeUsed

Original issue's description:
> [chromedriver] Add shadow DOM support to chromedriver.
>
> BUG=chromedriver:852
>
> TEST= added some unit tests (beginning with testShadowDom) to chrome/test/chromedriver/test/run_py_tests.py
>
> R=samuong@chromium.org
>
> Committed: https://crrev.com/713e22356d84f46633890df2be12860b0d6a16ee
> Cr-Commit-Position: refs/heads/master@{#309002}

TBR=mcharsley@google.com
NOTREECHECKS=true
NOTRY=true
BUG=chromedriver:852
Committed: https://crrev.com/f52eda659eba356621fd01a78088fa243a59b51a
Cr-Commit-Position: refs/heads/master@{#309398}

[samuong, 2014-12-22 06:24:27]

Created Revert of [chromedriver] Add shadow DOM support to chromedriver.

[commit-bot: I haz the power, 2014-12-22 06:24:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/824603002/1

[commit-bot: I haz the power, 2014-12-22 06:25:49]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-12-22 06:27:48]

Patchset 1 (id:??) landed as
https://crrev.com/f52eda659eba356621fd01a78088fa243a59b51a
Cr-Commit-Position: refs/heads/master@{#309398}