Add 'colno' attribute to ErrorEvent interface

Source/core/dom/ErrorEvent.cpp

Index: Source/core/dom/ErrorEvent.cpp
diff --git a/Source/core/dom/ErrorEvent.cpp b/Source/core/dom/ErrorEvent.cpp
index db11e534da322ceb9441137f84bf18ebca988f0f..7c4b3c169307e2370ce394ee6c8ee9fcda681355 100644
--- a/Source/core/dom/ErrorEvent.cpp
+++ b/Source/core/dom/ErrorEvent.cpp
@@ -39,6 +39,7 @@ ErrorEventInit::ErrorEventInit()
     : message()
     , filename()
     , lineno(0)
+    , colno(0)
 {
 }
 
@@ -52,7 +53,7 @@ ErrorEvent::ErrorEvent(const AtomicString& type, const ErrorEventInit& initializ
     , m_message(initializer.message)
     , m_fileName(initializer.filename)
     , m_lineNumber(initializer.lineno)
-    , m_columnNumber(initializer.column)
+    , m_columnNumber(initializer.colno)
 {
     ScriptWrappable::init(this);
 }