Revert of Fix to keep the selection of the text field in input element after setSelectionRange is called by d… (patchset #7 id:160001 of https://codereview.chromium.org/507533002/)

Reason for revert:
Suspected cause of flaky failures of org.chromium.content.browser.input.ImeTest on Android bots - see http://crbug.com/411756

Original issue's description:
> Fix to keep the selection of the text field in input element after setSelectionRange is called by dom events related to mouse
> 
> The problem is that the selection is cleared when handling mouse release.
> The selection should be kept if the selection is set by setSelectionRange during handling mouse event.
> 
> BUG=32865
> R=yosin@chromium.org
> R=rbyers@chromium.org
> TEST=LayoutTests/fast/forms/setrangetext-within-events.html
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=181490

TBR=yosin@chromium.org,yoichio@chromium.org,rbyers@chromium.org,kenjibaheux@chromium.org,myid.o.shin@gmail.com
NOTREECHECKS=true
NOTRY=true
BUG=32865

Review URL: https://codereview.chromium.org/548413002

git-svn-id: svn://svn.chromium.org/blink/trunk@181565 bbb929c8-8fbe-4397-9dbb-9b2b20218538