[mac] Remove -[WebView setHoverFeedbackSuspended:]

[mac] Remove -[WebView setHoverFeedbackSuspended:]
https://bugs.webkit.org/show_bug.cgi?id=75406

Reviewed by Tim Hatcher.

* WebView/WebHTMLView.mm:
(-[WebHTMLView _updateMouseoverWithEvent:]): Removed check for suspended hover updates.
* WebView/WebHTMLViewInternal.h: Removed -_hoverFeedbackSuspendedChanged.
* WebView/WebView.mm:
(-[WebView setHoverFeedbackSuspended:]): Left empty implementation to support versions of
Safari that call this.
(-[WebView isHoverFeedbackSuspended]): Left implementation that always returns NO to support
versions of Safari that call this.
* WebView/WebViewData.h: Removed hoverFeedbackSuspended ivar.
* WebView/WebViewPrivate.h: Removed method definitions.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@103910 268f45cc-cd09-0410-ab3c-d52691b4dbfc