Add support for printing multicol containers, and enable it.

third_party/WebKit/Source/core/css/html.css

Index: third_party/WebKit/Source/core/css/html.css
diff --git a/third_party/WebKit/Source/core/css/html.css b/third_party/WebKit/Source/core/css/html.css
index 41cae0155e495310edae0224da6a5e762da0c041..3752a17fdbc8d9dc4254e1d2f3976a0afa74e23b 100644
--- a/third_party/WebKit/Source/core/css/html.css
+++ b/third_party/WebKit/Source/core/css/html.css
@@ -1120,11 +1120,5 @@ dialog::backdrop {
     border-width: 0px;
 }
 
-/* Disable multicol in printing, since it's not implemented properly. See crbug.com/99358 */
-
-@media print {
-    * { -webkit-columns: auto !important; }
-}
-
 /* noscript is handled internally, as it depends on settings. */