[Ribbon] Move FilterEnabledPropertiesIntoVector to CSSProperty

Not sure about this choice of home for this method.

This CL also deletes CSSPropertyMetadata class.

Bug: 751373
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_dbg_ng
Change-Id: I812df195574ee38f2e798dd7fdb7986b15efad22
Reviewed-on: https://chromium-review.googlesource.com/652207
Commit-Queue: Renée Wright <rjwright@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: meade_UTC10 <meade@chromium.org>
Reviewed-by: Bugs Nash <bugsnash@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#500540}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 6d76d1aeb62ce848e5d74fc6a21011e4a04d304a

check_gn_headers_whitelist.txt

@@ -252,7 +252,6 @@ testing/gmock_mutant.h
 third_party/WebKit/Source/bindings/modules/v8/serialization/WebCryptoSubTags.h
 third_party/WebKit/Source/core/animation/CSSInterpolationEnvironment.h
 third_party/WebKit/Source/core/animation/SVGInterpolationEnvironment.h
-third_party/WebKit/Source/core/css/CSSPropertyMetadata.h
 third_party/WebKit/Source/core/css/resolver/StyleBuilder.h
 third_party/WebKit/Source/core/css/threaded/MultiThreadedTestUtil.h
 third_party/WebKit/Source/core/css/zoomAdjustedPixelValue.h