[Qt][WK2] Refactor GestureRecognizers to use QtWebPageEventHandler

[Qt][WK2] Refactor GestureRecognizers to use QtWebPageEventHandler
https://bugs.webkit.org/show_bug.cgi?id=73096

Reviewed by Kenneth Rohde Christiansen.

Move all the interaction engine usage to QtWebPageEventHandler,
making all GestureRecognizers (Tap, Pinch and Pan) use it directly.

* UIProcess/qt/QtGestureRecognizer.cpp:
(WebKit::QtGestureRecognizer::QtGestureRecognizer):
* UIProcess/qt/QtGestureRecognizer.h:
* UIProcess/qt/QtPanGestureRecognizer.cpp:
(WebKit::QtPanGestureRecognizer::QtPanGestureRecognizer):
(WebKit::QtPanGestureRecognizer::recognize):
* UIProcess/qt/QtPanGestureRecognizer.h:
* UIProcess/qt/QtPinchGestureRecognizer.cpp:
(WebKit::QtPinchGestureRecognizer::QtPinchGestureRecognizer):
(WebKit::QtPinchGestureRecognizer::recognize):
* UIProcess/qt/QtPinchGestureRecognizer.h:
* UIProcess/qt/QtTapGestureRecognizer.cpp:
(WebKit::QtTapGestureRecognizer::QtTapGestureRecognizer):
(WebKit::QtTapGestureRecognizer::recognize):
(WebKit::QtTapGestureRecognizer::tapTimeout):
* UIProcess/qt/QtTapGestureRecognizer.h:
* UIProcess/qt/QtWebPageEventHandler.cpp:
(QtWebPageEventHandler::QtWebPageEventHandler):
(QtWebPageEventHandler::setViewportInteractionEngine):
* UIProcess/qt/QtWebPageEventHandler.h:
(QtWebPageEventHandler::interactionEngine):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@101179 268f45cc-cd09-0410-ab3c-d52691b4dbfc