Make it explicit which code paths iOS should use when doing checks based on OS X...

Make it explicit which code paths iOS should use when doing checks based on OS X versions.

Rubber-stamped by David Kilzer.

* WebCore.exp.in:
* accessibility/AccessibilityList.h:
* accessibility/AccessibilityTable.h:
* accessibility/mac/AXObjectCacheMac.mm:
* editing/mac/EditorMac.mm:
* loader/MainResourceLoader.cpp:
* loader/MainResourceLoader.h:
* page/AlternativeTextClient.h:
* page/mac/SettingsMac.mm:
* platform/LocalizedStrings.cpp:
* platform/MemoryPressureHandler.cpp:
* platform/audio/mac/AudioBusMac.mm:
* platform/graphics/Gradient.h:
* platform/graphics/avfoundation/objc/MediaPlayerPrivateAVFoundationObjC.mm:
* platform/graphics/ca/GraphicsLayerCA.cpp:
* platform/graphics/ca/PlatformCALayer.h:
* platform/graphics/ca/mac/PlatformCALayerMac.mm:
* platform/graphics/ca/mac/TileCache.mm:
* platform/graphics/cg/GraphicsContextCG.cpp:
* platform/graphics/cg/ImageBufferCG.cpp:
* platform/graphics/cg/ImageBufferDataCG.h:
* platform/graphics/cg/ImageCG.cpp:
* platform/graphics/cg/ImageSourceCG.cpp:
* platform/graphics/cocoa/FontPlatformDataCocoa.mm:
* platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp:
* platform/graphics/mac/ComplexTextController.cpp:
* platform/graphics/mac/ComplexTextControllerCoreText.mm:
* platform/graphics/mac/FontCacheMac.mm:
* platform/graphics/mac/FontCustomPlatformData.cpp:
* platform/graphics/mac/FontMac.mm:
* platform/graphics/mac/GraphicsContextMac.mm:
* platform/graphics/mac/SimpleFontDataMac.mm:
* platform/graphics/mac/WebLayer.h:
* platform/graphics/mac/WebLayer.mm:
* platform/graphics/opengl/GraphicsContext3DOpenGL.cpp:
* platform/mac/DisplaySleepDisabler.cpp:
* platform/mac/DisplaySleepDisabler.h:
* platform/mac/HTMLConverter.h:
* platform/mac/HTMLConverter.mm:
* platform/mac/MemoryPressureHandlerMac.mm:
* platform/mac/SharedTimerMac.mm:
* platform/mac/SuddenTermination.mm:
* platform/mac/WebFontCache.mm:
* platform/network/Credential.h:
* platform/network/ResourceHandle.h:
* platform/network/cf/DNSCFNet.cpp:
* platform/network/cf/ProxyServerCFNet.cpp:
* platform/network/cf/ResourceRequest.h:
* platform/network/cf/SocketStreamHandleCFNet.cpp:
* platform/network/mac/AuthenticationMac.mm:
* platform/network/mac/CookieStorageMac.mm:
* platform/network/mac/ResourceHandleMac.mm:
* platform/network/mac/ResourceRequestMac.mm:
* platform/network/mac/WebCoreURLResponse.mm:
* platform/text/TextChecking.h:
* platform/text/cf/HyphenationCF.cpp:
* platform/text/mac/HyphenationMac.mm:
* rendering/RenderLayerBacking.cpp:
* rendering/RenderLayerCompositor.cpp:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@122670 268f45cc-cd09-0410-ab3c-d52691b4dbfc