Use switches for CSSPropertyMetadata::isDescriptorOnly.

third_party/WebKit/Source/build/scripts/templates/CSSPropertyMetadata.cpp.tmpl

Index: third_party/WebKit/Source/build/scripts/templates/CSSPropertyMetadata.cpp.tmpl
diff --git a/third_party/WebKit/Source/build/scripts/templates/CSSPropertyMetadata.cpp.tmpl b/third_party/WebKit/Source/build/scripts/templates/CSSPropertyMetadata.cpp.tmpl
index 917fe7564d0ff6466e6b21f051961b1360142a9a..b9fe6ea0afdbad7f79b4aab901b2f464baea397d 100644
--- a/third_party/WebKit/Source/build/scripts/templates/CSSPropertyMetadata.cpp.tmpl
+++ b/third_party/WebKit/Source/build/scripts/templates/CSSPropertyMetadata.cpp.tmpl
@@ -62,8 +62,4 @@ void CSSPropertyMetadata::filterEnabledCSSPropertiesIntoVector(
   }
 }
 
-bool CSSPropertyMetadata::isDescriptorOnly(CSSPropertyID property) {
-    return property >= {{descriptors[0].property_id}} && property <= {{descriptors[-1].property_id}};
-}
-
 } // namespace blink