Turn on img@sizes compile flag

Turn on img@sizes compile flag
https://bugs.webkit.org/show_bug.cgi?id=134634

Reviewed by Benjamin Poulain.

Source/JavaScriptCore:
* Configurations/FeatureDefines.xcconfig: Moved compile flag to alphabetical order.

Source/WebCore:
* Configurations/FeatureDefines.xcconfig: Moved compile flag to alphabetical order.

Source/WebKit:
* mac/Configurations/FeatureDefines.xcconfig: Moved compile flag to alphabetical order.

Source/WebKit2:
* Configurations/FeatureDefines.xcconfig: Moved compile flag to alphabetical order.

Source/WTF:
* wtf/FeatureDefines.h: Added compile flag definition.

Tools:
* Scripts/webkitperl/FeatureList.pm: Turn on the img@sizes feature.

WebKitLibraries:
* win/tools/vsprops/FeatureDefines.props: Added compile flag.

LayoutTests:
* TestExpectations: Turned on layout tests for the img@sizes feature.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@170837 268f45cc-cd09-0410-ab3c-d52691b4dbfc