[mac] Remove WebTiledLayer
https://bugs.webkit.org/show_bug.cgi?id=123395

Reviewed by Anders Carlsson.

Source/WebCore:

Mac doesn't use CATiledLayer at all anymore. We have to keep
LayerTypeTiledLayer around for Windows, for now, but we can
get rid of WebTiledLayer and some related Mac-specific code.

No new tests, just removing dead code.

* WebCore.xcodeproj/project.pbxproj:
Remove WebTiledLayer.*

* platform/graphics/ca/PlatformCALayer.h:
* platform/graphics/ca/mac/PlatformCALayerMac.h:
* platform/graphics/ca/mac/PlatformCALayerMac.mm:
(PlatformCALayerMac::PlatformCALayerMac):
Remove synchronouslyDisplayTilesInRect, which was only used for WebTiledLayer on Mac.
Remove WebTiledLayer instantiation and setup code.

* platform/graphics/mac/WebTiledLayer.h: Removed.
* platform/graphics/mac/WebTiledLayer.mm: Removed.

Source/WebKit2:

* WebProcess/WebPage/mac/PlatformCALayerRemote.cpp:
* WebProcess/WebPage/mac/PlatformCALayerRemote.h:
Remove synchronouslyDisplayTilesInRect.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@158096 268f45cc-cd09-0410-ab3c-d52691b4dbfc