Normalize ENABLE_ENCRYPTED_MEDIA definitions across all FeatureDefines files.
https://bugs.webkit.org/show_bug.cgi?id=110806

Source/WebCore:

Reviewed by Alexey Proskuryakov.

Ensure both ENCRYPTED_MEDIA and ENCRYPTED_MEDIA_V2 are enabled on macosx_1090.

* Configurations/FeatureDefines.xcconfig:

Fix some build errors which occurred when both ENCRYPTED_MEDIA and
ENCRYPTED_MEDIA_V2 were enabled:
* html/HTMLMediaElement.cpp:
(WebCore::HTMLMediaElement::webkitGenerateKeyRequest):
(WebCore::HTMLMediaElement::webkitAddKey):
* page/DOMWindow.idl:

Source/WebKit/mac:

Reviewed by Alexey Proskuryakov.

Ensure both ENCRYPTED_MEDIA and ENCRYPTED_MEDIA_V2 are enabled on macosx_1090.

* Configurations/FeatureDefines.xcconfig:

Source/WebKit2:

Ensure both ENCRYPTED_MEDIA and ENCRYPTED_MEDIA_V2 are enabled on macosx_1090.

Reviewed by Alexey Proskuryakov.

* Configurations/FeatureDefines.xcconfig:

Source/WTF:

Reviewed by Alexey Proskuryakov.

Ensure both ENCRYPTED_MEDIA and ENCRYPTED_MEDIA_V2 are enabled on macosx_1090.

* wtf/FeatureDefines.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@143984 268f45cc-cd09-0410-ab3c-d52691b4dbfc