Clean up after getPropertyCSSValue

Source/core/core.gypi

Index: Source/core/core.gypi
diff --git a/Source/core/core.gypi b/Source/core/core.gypi
index f34d026fd3c2298e576f2a2fb762c124887bd802..a3ab31c09a5da3c43005ea01cec374bc13abc8c0 100644
--- a/Source/core/core.gypi
+++ b/Source/core/core.gypi
@@ -21,7 +21,6 @@
             'css/CSSKeyframesRule.idl',
             'css/CSSMediaRule.idl',
             'css/CSSPageRule.idl',
-            'css/CSSPrimitiveValue.idl',
             'css/CSSRule.idl',
             'css/CSSRuleList.idl',
             'css/CSSStyleDeclaration.idl',
@@ -29,10 +28,7 @@
             'css/CSSStyleSheet.idl',
             'css/CSSSupportsRule.idl',
             'css/CSSUnknownRule.idl',
-            'css/CSSValue.idl',
-            'css/CSSValueList.idl',
             'css/CSSViewportRule.idl',
-            'css/Counter.idl',
             'css/FontFace.idl',
             'css/FontFaceSet.idl',
             'css/FontFaceSetForEachCallback.idl',
@@ -40,15 +36,11 @@
             'css/MediaList.idl',
             'css/MediaQueryList.idl',
             'css/MediaQueryListEvent.idl',
-            'css/RGBColor.idl',
-            'css/Rect.idl',
             'css/StyleMedia.idl',
             'css/StyleSheet.idl',
             'css/StyleSheetList.idl',
             'css/WebKitCSSFilterRule.idl',
-            'css/WebKitCSSFilterValue.idl',
             'css/WebKitCSSMatrix.idl',
-            'css/WebKitCSSTransformValue.idl',
             'dom/ArrayBuffer.idl',
             'dom/ArrayBufferView.idl',
             'dom/Attr.idl',
@@ -888,8 +880,6 @@
             'css/PropertySetCSSStyleDeclaration.cpp',
             'css/PropertySetCSSStyleDeclaration.h',
             'css/PseudoStyleRequest.h',
-            'css/RGBColor.cpp',
-            'css/RGBColor.h',
             'css/Rect.cpp',
             'css/Rect.h',
             'css/RemoteFontFaceSource.cpp',