WebWheelEvent::Phase and PlatformWheelEvent::Phase declarations should match AppKit

WebWheelEvent::Phase and PlatformWheelEvent::Phase declarations should match AppKit
https://bugs.webkit.org/show_bug.cgi?id=77123

Reviewed by Beth Dakin.

Source/WebCore:

* platform/PlatformWheelEvent.h:
():
* platform/mac/PlatformEventFactoryMac.mm:
(WebCore::phaseForEvent):

Source/WebKit2:

* Shared/WebEvent.h:
():
* Shared/mac/WebEventFactory.mm:
(WebKit::phaseForEvent):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@106021 268f45cc-cd09-0410-ab3c-d52691b4dbfc