CSS.escape('\0') should not throw.

third_party/WebKit/Source/core/css/DOMWindowCSS.cpp

Index: third_party/WebKit/Source/core/css/DOMWindowCSS.cpp
diff --git a/third_party/WebKit/Source/core/css/DOMWindowCSS.cpp b/third_party/WebKit/Source/core/css/DOMWindowCSS.cpp
index be978a78da607d5f9c5d5224770c012730a6605a..8b05f6d030cb63e8588762b3b9329117c23a55be 100644
--- a/third_party/WebKit/Source/core/css/DOMWindowCSS.cpp
+++ b/third_party/WebKit/Source/core/css/DOMWindowCSS.cpp
@@ -30,12 +30,10 @@
 #include "config.h"
 #include "core/css/DOMWindowCSS.h"
 
-#include "bindings/core/v8/ExceptionState.h"
 #include "core/css/CSSMarkup.h"
 #include "core/css/CSSPropertyMetadata.h"
 #include "core/css/StylePropertySet.h"
 #include "core/css/parser/CSSParser.h"
-#include "core/dom/ExceptionCode.h"
 #include "wtf/text/StringBuilder.h"
 #include "wtf/text/WTFString.h"
 
@@ -58,13 +56,10 @@ bool DOMWindowCSS::supports(const String& conditionText)
     return CSSParser::parseSupportsCondition(conditionText);
 }
 
-String DOMWindowCSS::escape(const String& ident, ExceptionState& exceptionState)
+String DOMWindowCSS::escape(const String& ident)
 {
     StringBuilder builder;
-    if (!serializeIdentifier(ident, builder)) {
-        exceptionState.throwDOMException(InvalidCharacterError, "The string contains an invalid character.");
-        return String();
-    }
+    serializeIdentifier(ident, builder);
     return builder.toString();
 }