[Qt][WK2] Remove unneeded method didResumeContent from PageViewportController clients
https://bugs.webkit.org/show_bug.cgi?id=110751

Reviewed by Jocelyn Turcotte.

This is a clean-up in the PageViewportController clients that removes leftover
code from previous design that is partially unused and unnecessary, to simplify
the interaction between PageViewportController and clients.

* UIProcess/PageViewportController.cpp:
(WebKit::PageViewportController::resumeContent):
* UIProcess/PageViewportControllerClient.h:
(PageViewportControllerClient):
* UIProcess/efl/PageViewportControllerClientEfl.cpp:
* UIProcess/efl/PageViewportControllerClientEfl.h:
(PageViewportControllerClientEfl):
* UIProcess/qt/PageViewportControllerClientQt.cpp:
(WebKit::PageViewportControllerClientQt::animateContentRectVisible):
(WebKit::PageViewportControllerClientQt::flickMoveEnded):
(WebKit::PageViewportControllerClientQt::resumeAndUpdateContent):
(WebKit::PageViewportControllerClientQt::pinchGestureCancelled):
* UIProcess/qt/PageViewportControllerClientQt.h:
(PageViewportControllerClientQt):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@143935 268f45cc-cd09-0410-ab3c-d52691b4dbfc