https://bugs.webkit.org/show_bug.cgi?id=106742

Reviewed by Simon Fraser.

Source/JavaScriptCore: 

Enable speech synthesis for the Mac.

* Configurations/FeatureDefines.xcconfig:

Source/WebCore: 

Enable speech synthesis for the Mac.

* Configurations/FeatureDefines.xcconfig:

Source/WebKit/mac: 

Enable speech synthesis for the Mac.

* Configurations/FeatureDefines.xcconfig:

Source/WebKit2: 

Enable speech synthesis for the Mac.

* Configurations/FeatureDefines.xcconfig:

LayoutTests: 

Unskip speech synthesis tests.

* fast/dom/script-tests/constructed-objects-prototypes.js:
(constructorPropertiesOnWindow):
* platform/mac/TestExpectations:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@144698 268f45cc-cd09-0410-ab3c-d52691b4dbfc