Remove WebDocument::createEvent.

content/shell/renderer/ipc_echo.cc

Index: content/shell/renderer/ipc_echo.cc
diff --git a/content/shell/renderer/ipc_echo.cc b/content/shell/renderer/ipc_echo.cc
index 5bdb320ddad3165d775f8f4ca387b2271a1ee9fe..12f049b3220c44a4f68aed9a6ee82fc9b3f99099 100644
--- a/content/shell/renderer/ipc_echo.cc
+++ b/content/shell/renderer/ipc_echo.cc
@@ -111,12 +111,7 @@ void IPCEcho::RequestEcho(int id, int size) {
 void IPCEcho::DidRespondEcho(int id, int size) {
   last_echo_id_ = id;
   last_echo_size_ = size;
-  blink::WebString eventName = blink::WebString::fromUTF8("CustomEvent");
-  blink::WebString eventType = blink::WebString::fromUTF8("pong");
-  blink::WebDOMEvent event = document_.createEvent(eventName);
-  event.to<blink::WebDOMCustomEvent>().initCustomEvent(
-      eventType, false, false, blink::WebSerializedScriptValue());
-  document_.dispatchEvent(event);
+  document_.dispatchEvent(blink::WebDOMCustomEvent("pong"));
 }
 
 void IPCEcho::Install(blink::WebFrame* frame) {