Further update gesture swipe shadow style
https://bugs.webkit.org/show_bug.cgi?id=144215
<rdar://problem/
19295843>
Reviewed by Dan Bernstein.
* Resources/mac/SwipeShadow.png: Removed.
* Resources/mac/SwipeShadow@2x.png: Removed.
* UIProcess/mac/ViewGestureController.h:
* UIProcess/mac/ViewGestureControllerMac.mm:
(WebKit::ViewGestureController::beginSwipeGesture):
* WebKit2.xcodeproj/project.pbxproj:
Use a CAGradientLayer instead of PNGs for the swipe shadow.
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@183349
268f45cc-cd09-0410-ab3c-
d52691b4dbfc