Revert of [Android] Support unfocusable container views.

Revert of [Android] Support unfocusable container views. (patchset #4 id:60001 of https://codereview.chromium.org/701233002/)

Reason for revert:
Introduced flake into WebRTCBrowserTest.* http://build.chromium.org/p/chromium.linux/buildstatus?builder=Android%20Tests%20%28dbg%29&number=23952

Example:
Value of: ExecuteScriptAndExtractString(shell()->web_contents(), javascript, &result)
  Actual: false
Expected: true
From javascript: ../../content/test/webrtc_content_browsertest_base.cc:71: Failure
Failed
[INFO:CONSOLE(883)] "Receiving remote stream...", source: http://127.0.0.1:50076/media/peerconnection-call.html (883)
[INFO:CONSOLE(859)] "Receiving answer...", source: http://127.0.0.1:50076/media/peerconnection-call.html (859)
[  FAILED  ] WebRtcBrowserTest.AddTwoMediaStreamsToOnePC, where TypeParam =  and GetParam() =  (2180 ms)

Original issue's description:
> [Android] Support unfocusable container views.
>
> If the ContentViewCore container view is not focusable (which can
> happen when it's emebedded in an app via android webview), we
> were clearing the RWHVA notion of focus when the RenderView was
> swapped out. As the view is never focusable again, chromium never
> considers this view focused and as such, text selection did not
> function.
>
> We support this type of container view by always treating it focused
> from Chromium's point of view.
>
> BUG=430859
(internal b/18066784)
>
> Committed: https://crrev.com/9074d9fc9119ef4d2223f6c993d1a1b67a0bea7c
> Cr-Commit-Position: refs/heads/master@{#303071}

TBR=jdduke@chromium.org,benm@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=430859
(internal b/18066784)

Committed: https://crrev.com/1906fd177547e131f1320346df164a5dfd2122e4
Cr-Commit-Position: refs/heads/master@{#303104}

[Nicolas Zea, 2014-11-06 22:37:36]

Created Revert of [Android] Support unfocusable container views.

[commit-bot: I haz the power, 2014-11-06 22:38:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/712433002/1

[commit-bot: I haz the power, 2014-11-06 22:39:54]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-11-06 22:40:39]

Patchset 1 (id:??) landed as
https://crrev.com/1906fd177547e131f1320346df164a5dfd2122e4
Cr-Commit-Position: refs/heads/master@{#303104}

[Nicolas Zea, 2014-11-06 22:56:14]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/707043002/ by zea@chromium.org.

The reason for reverting is: Did not fix flake..