Replace wkGetGlyphsForCharacters() with CGFontGetGlyphsForUnichars()
https://bugs.webkit.org/show_bug.cgi?id=137197

Reviewed by Alexey Proskuryakov.

No new tests because there is no behavior change.

Source/WebCore:

* WebCore.exp.in:
* WebCore.order:
* WebCore.xcodeproj/project.pbxproj:
* platform/graphics/mac/GlyphPageTreeNodeMac.cpp:
(WebCore::GlyphPage::fill): Use SPI call instead of WKSI call
* platform/mac/WebCoreSystemInterface.h:
* platform/mac/WebCoreSystemInterface.mm:
* platform/spi/cocoa/CGFontUnicodeSupport.h: Added for SPI call.

Source/WebKit:

* mac/WebCoreSupport/WebSystemInterface.mm:
(InitWebCoreSystemInterface):
* WebKit.order:

Source/WebKit2:

* WebProcess/WebCoreSupport/mac/WebSystemInterface.mm:
(InitWebCoreSystemInterface):
* mac/WebKit2.order:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@174052 268f45cc-cd09-0410-ab3c-d52691b4dbfc