createElement should not transmit exceptions but report them.

third_party/WebKit/Source/core/dom/custom/CustomElement.h

Index: third_party/WebKit/Source/core/dom/custom/CustomElement.h
diff --git a/third_party/WebKit/Source/core/dom/custom/CustomElement.h b/third_party/WebKit/Source/core/dom/custom/CustomElement.h
index 8bfc6f778db80f9a252a1e191285e95373ee0a73..840e3f22ebd29473d7da5cbdf888755db7d1ce2f 100644
--- a/third_party/WebKit/Source/core/dom/custom/CustomElement.h
+++ b/third_party/WebKit/Source/core/dom/custom/CustomElement.h
@@ -66,11 +66,7 @@ class CORE_EXPORT CustomElement {
   static bool shouldCreateCustomElement(const QualifiedName&);
 
   static HTMLElement* createCustomElementSync(Document&,
-                                              const AtomicString& localName,
-                                              ExceptionState&);
-  static HTMLElement* createCustomElementSync(Document&,
-                                              const QualifiedName&,
-                                              ExceptionState&);
+                                              const AtomicString& localName);
   static HTMLElement* createCustomElementSync(Document&, const QualifiedName&);
   static HTMLElement* createCustomElementAsync(Document&, const QualifiedName&);