https://bugs.webkit.org/show_bug.cgi?id=120264

Reviewed by Andreas Kling.

* dom/Document.cpp:
(WebCore::Document::createRenderTree): Renamed attach to this.
This made it practical to remove a comment that says the same thing and
also helps make the purpose of the function considerably more clear,
although the relationship to the attached and detach functions is now
less clear; should fix that soon.
(WebCore::pageWheelEventHandlerCountChanged): Added. Contains the code
from Frame::notifyChromeClientWheelEventHandlerCountChanged, minus some
assertions that were only needed because the function was passed a frame
rather than a page.
(WebCore::Document::didBecomeCurrentDocumentInFrame): Added. Contains
most of the code from Frame::setDocument. Looking at before and after,
we can see that most of the work is within the document class and matches
up with other code already in this class. Added FIXMEs about many problems
spotted in the code.
(WebCore::Document::topDocument): Added FIXME and tweaked formatting.
(WebCore::wheelEventHandlerCountChanged): Moved the call to the
pageWheelEventHandlerCountChanged in here from the two call sites.
Also added a FIXME.
(WebCore::Document::didAddWheelEventHandler): Removed the call to
notifyChromeClientWheelEventHandlerCountChanged, since that's now handled
inside wheelEventHandlerCountChanged.
(WebCore::Document::didRemoveWheelEventHandler): Ditto.

* dom/Document.h: Renamed attach to createRenderTree, made it private,
and added a new didBecomeCurrentDocumentInFrame function.

* loader/PlaceholderDocument.cpp:
(WebCore::PlaceholderDocument::createRenderTree): Renamed from attach.
* loader/PlaceholderDocument.h: Did the rename and made the function a
private override.

* page/Frame.cpp:
(WebCore::Frame::setDocument): Moved most of this function out of here
into the new Document::didBecomeCurrentDocumentInFrame function.
Also deleted notifyChromeClientWheelEventHandlerCountChanged.

* page/Frame.h: Deleted notifyChromeClientWheelEventHandlerCountChanged.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@154573 268f45cc-cd09-0410-ab3c-d52691b4dbfc