Unreviewed buildfix after r166441 and r166443.

Source/WebCore:

* CMakeLists.txt: Add platform/audio/AudioHardwareListener.cpp.

Source/WebKit2:

Missing PLATFORM(COCOA) guards added.

* WebProcess/Plugins/Netscape/NPRuntimeObjectMap.cpp:
(WebKit::NPRuntimeObjectMap::evaluate):
* WebProcess/Plugins/PluginProxy.cpp:
* WebProcess/Plugins/PluginProxy.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@166451 268f45cc-cd09-0410-ab3c-d52691b4dbfc