Throw an exception when denying access to 'Frame's 'location' setter.

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 7c4b3c169307e2370ce394ee6c8ee9fcda681355..ecb3d4b842da6957d0d6b775c7eb058957df44ab 100644
--- a/Source/core/dom/ErrorEvent.cpp
+++ b/Source/core/dom/ErrorEvent.cpp
@@ -50,7 +50,7 @@ ErrorEvent::ErrorEvent()
 
 ErrorEvent::ErrorEvent(const AtomicString& type, const ErrorEventInit& initializer)
     : Event(type, initializer)
-    , m_message(initializer.message)
+    , m_sanitizedMessage(initializer.message)
     , m_fileName(initializer.filename)
     , m_lineNumber(initializer.lineno)
     , m_columnNumber(initializer.colno)
@@ -60,7 +60,7 @@ ErrorEvent::ErrorEvent(const AtomicString& type, const ErrorEventInit& initializ
 
 ErrorEvent::ErrorEvent(const String& message, const String& fileName, unsigned lineNumber, unsigned columnNumber)
     : Event(eventNames().errorEvent, false, true)
-    , m_message(message)
+    , m_sanitizedMessage(message)
     , m_fileName(fileName)
     , m_lineNumber(lineNumber)
     , m_columnNumber(columnNumber)
@@ -68,6 +68,12 @@ ErrorEvent::ErrorEvent(const String& message, const String& fileName, unsigned l
     ScriptWrappable::init(this);
 }
 
+void ErrorEvent::setUnsanitizedMessage(const String& message)
+{
+    ASSERT(m_unsanitizedMessage.isEmpty());
+    m_unsanitizedMessage = message;
+}
+
 ErrorEvent::~ErrorEvent()
 {
 }