Fixed text selection is cleared when user try to scroll in editable content.

Fixed text selection is cleared when user try to scroll in editable content.

[Title] Fixed text selection is cleared when user try to scroll in editable content.
[Issue#] P130301-2648
[Problem] text selection is cleared when user try to scroll in editable content.
[Cause] There is routine to clear text selection when user try to scroll in editable content.
[Solution] Removed routine to clear text selection when user try to scroll in editable content.
           Added routine to update text selection when scrolling is performed by javascript.

Change-Id: I233a187a4cf1a257bd981e7bb33b0db9c1f2302b