Revert of Avoids releasing capture in EndMoveLoop if capture was switched to another window while ..

Revert of Avoids releasing capture in EndMoveLoop if capture was switched to another window while dragging (https://codereview.chromium.org/265843004/)

Reason for revert:
Appears to be responsible for ash_unittests failing on Linux ChromiumOS Tests(1): http://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Tests%20%281%29/builds/43114

Original issue's description:
> Avoids releasing capture in EndMoveLoop if capture was switched to another window while dragging.
> This variant relies on checking if a drag input window still has capture before releasing the grab.
> A better alternative is in CL https://codereview.chromium.org/262893002/.
> 
> BUG=363503
> TEST=Follow the exact steps in the bug description.
> TEST=interactive_ui_tests --gtest_filter=*TabDragging*
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=269593

TBR=sadrul@chromium.org,varkha@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=363503
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=269629

[mdempsky, 2014-05-10 20:29:07]

Created Revert of Avoids releasing capture in EndMoveLoop if capture was
switched to another window while dragging

[commit-bot: I haz the power, 2014-05-10 20:29:24]

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

[mdempsky, 2014-05-10 20:30:24]

The CQ bit was checked by mdempsky@chromium.org

[commit-bot: I haz the power, 2014-05-10 20:30:42]

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

[Alpha Left Google, 2014-05-10 20:31:28]

The CQ bit was checked by hclam@chromium.org

[commit-bot: I haz the power, 2014-05-10 20:31:58]

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

[Alpha Left Google, 2014-05-10 20:33:58]

lgtm

lgtm

[commit-bot: I haz the power, 2014-05-10 20:34:25]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/mdempsky@chromium.org/276163002/1

[commit-bot: I haz the power, 2014-05-10 20:36:02]

Change committed as 269629