When long tap on other input box, endTap() is performed.

When long tap on other input box, endTap() is performed.

[Title] When long tap on other input box, endTap() is performed.
[Issue#] N/A
[Problem] User long tap on an input box and then, when long tap on other input box,
          Magnifier is displayed above previous input box.
[Cause] Magnifier is displayed above rootEditableElement that has caret
        bacause there is caret in previous input box.
        So, this issue occur.
[Solution] When long tap on other input box, textSelectionDown() return false.
           If textSelectionDown() return false, endTap() for other input box is performed.

Change-Id: Ia25f1f0b2878b5aa1d0a14059d1d428731e2af01