Remove CanvasProxy

Remove CanvasProxy
https://bugs.webkit.org/show_bug.cgi?id=176288

Patch by Sam Weinig <sam@webkit.org> on 2017-09-03
Reviewed by Yusuke Suzuki.

CanvasProxy does not appear to be in any current HTML spec
and was disabled and unimplemented in our tree. Time to
get rid of it.

.:

* Source/cmake/OptionsMac.cmake:
* Source/cmake/OptionsWin.cmake:
* Source/cmake/WebKitFeatures.cmake:
* Source/cmake/tools/vsprops/FeatureDefines.props:
* Source/cmake/tools/vsprops/FeatureDefinesCairo.props:

Source/JavaScriptCore:

* Configurations/FeatureDefines.xcconfig:

Source/WebCore:

* CMakeLists.txt:
* Configurations/FeatureDefines.xcconfig:
* DerivedSources.cpp:
* DerivedSources.make:
* WebCore.xcodeproj/project.pbxproj:
* html/canvas/CanvasProxy.cpp: Removed.
* html/canvas/CanvasProxy.h: Removed.
* html/canvas/CanvasProxy.idl: Removed.

Source/WebCore/PAL:

* Configurations/FeatureDefines.xcconfig:

Source/WebKit:

* Configurations/FeatureDefines.xcconfig:

Source/WebKitLegacy/mac:

* Configurations/FeatureDefines.xcconfig:

Source/WTF:

* wtf/FeatureDefines.h:

Tools:

* Scripts/webkitperl/FeatureList.pm:
* TestWebKitAPI/Configurations/FeatureDefines.xcconfig:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@221547 268f45cc-cd09-0410-ab3c-d52691b4dbfc