Avoid including Mac-specific headers.

* WebCoreSupport/WebFrameNetworkingContext.cpp: Stub out
CFNetwork-based implementations.
* WebCoreSupport/WebFrameNetworkingContext.h: Exclude
CFNetwork data types.
* WebCoreSupport/WebPlatformStrategies.cpp: Stub out
CFNetwork-based implementations.
* WebCoreSupport/WebPlatformStrategies.h: Exclude
CFNetwork data types.

Source/WebKit2: [WinCairo] Build correction after r134960.

* WebProcess/WebCoreSupport/WebPlatformStrategies.cpp:  Stub out
calls to CFNetwork-based implementation.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@135010 268f45cc-cd09-0410-ab3c-d52691b4dbfc