createElement should not transmit exceptions but report them.

third_party/WebKit/Source/core/dom/custom/CustomElementRegistryTest.cpp

Index: third_party/WebKit/Source/core/dom/custom/CustomElementRegistryTest.cpp
diff --git a/third_party/WebKit/Source/core/dom/custom/CustomElementRegistryTest.cpp b/third_party/WebKit/Source/core/dom/custom/CustomElementRegistryTest.cpp
index 55aaac375be3d92a80249114edb7d56865822492..00c17136bac1dc23c46fa301fc41c330d8554244 100644
--- a/third_party/WebKit/Source/core/dom/custom/CustomElementRegistryTest.cpp
+++ b/third_party/WebKit/Source/core/dom/custom/CustomElementRegistryTest.cpp
@@ -186,12 +186,6 @@ class TestCustomElementDefinition : public CustomElementDefinition {
   HTMLElement* createElementSync(Document&, const QualifiedName&) override {
     return nullptr;
   }
-
-  HTMLElement* createElementSync(Document&,
-                                 const QualifiedName&,
-                                 ExceptionState&) override {
-    return nullptr;
-  }
 };
 
 // Classes which use trace macros cannot be local because of the