2nd arg of document.createElement should be an object

third_party/WebKit/Source/core/frame/Deprecation.cpp

Index: third_party/WebKit/Source/core/frame/Deprecation.cpp
diff --git a/third_party/WebKit/Source/core/frame/Deprecation.cpp b/third_party/WebKit/Source/core/frame/Deprecation.cpp
index efda275544b26e10c0d9b54789e4e30707001c57..cb6ef752d266c64c63255f4ea61db02899570a2d 100644
--- a/third_party/WebKit/Source/core/frame/Deprecation.cpp
+++ b/third_party/WebKit/Source/core/frame/Deprecation.cpp
@@ -376,6 +376,9 @@ String Deprecation::deprecationMessage(UseCounter::Feature feature)
     case UseCounter::NavigatorPointerEnabled:
         return "Navigator.pointerEnabled is a non-standard API added for experiments only. It will be removed in near future.";
 
+    case UseCounter::DocumentCreateElement2ndArg:

[dominicc (has gone to gerrit), 2016/09/15 01:19:24]

Maybe give this a more descriptive name, because createElement having a second
argument isn't deprecated; it's the future! Maybe mention ...StringHandling or
something in the name.

+        return "Document.createElement second argument string will be replaced in near future with the dictionary. See https://dom.spec.whatwg.org/#dom-document-createelement.";

[dominicc (has gone to gerrit), 2016/09/15 01:19:24]

Maybe make this more explicit: Change to passing a dictionary with 'is' *now*,
because that will work, and passing a string will stop being supported soon.

+
     // Features that aren't deprecated don't have a deprecation message.
     default:
         return String();