Make ExceptionCode be an enum that does not encode the "code" property

Source/core/dom/ExceptionCode.h

Index: Source/core/dom/ExceptionCode.h
diff --git a/Source/core/dom/ExceptionCode.h b/Source/core/dom/ExceptionCode.h
index 84b520e8a52f9fb4602e02de4cf9727a8c6ef2eb..6c57241aa1a98a7c6d0fdcf4b37f7bd3b51a8a6e 100644
--- a/Source/core/dom/ExceptionCode.h
+++ b/Source/core/dom/ExceptionCode.h
@@ -35,35 +35,35 @@ namespace WebCore {
     // changed or removed from the specifications.
     enum {
         INDEX_SIZE_ERR = 1,
-        HIERARCHY_REQUEST_ERR = 3,
-        WRONG_DOCUMENT_ERR = 4,
-        INVALID_CHARACTER_ERR = 5,
-        NO_MODIFICATION_ALLOWED_ERR = 7,
-        NOT_FOUND_ERR = 8,
-        NOT_SUPPORTED_ERR = 9,
-        INUSE_ATTRIBUTE_ERR = 10, // Historical. Only used in setAttributeNode etc which have been removed from the DOM specs.
+        HIERARCHY_REQUEST_ERR,
+        WRONG_DOCUMENT_ERR,
+        INVALID_CHARACTER_ERR,
+        NO_MODIFICATION_ALLOWED_ERR,
+        NOT_FOUND_ERR,
+        NOT_SUPPORTED_ERR,
+        INUSE_ATTRIBUTE_ERR, // Historical. Only used in setAttributeNode etc which have been removed from the DOM specs.
 
         // Introduced in DOM Level 2:
-        INVALID_STATE_ERR = 11,
-        SYNTAX_ERR = 12,
-        INVALID_MODIFICATION_ERR = 13,
-        NAMESPACE_ERR = 14,
-        INVALID_ACCESS_ERR = 15,
+        INVALID_STATE_ERR,
+        SYNTAX_ERR,
+        INVALID_MODIFICATION_ERR,
+        NAMESPACE_ERR,
+        INVALID_ACCESS_ERR,
 
         // Introduced in DOM Level 3:
-        TYPE_MISMATCH_ERR = 17, // Historical; use TypeError instead
+        TYPE_MISMATCH_ERR, // Historical; use TypeError instead
 
         // XMLHttpRequest extension:
-        SECURITY_ERR = 18,
+        SECURITY_ERR,
 
         // Others introduced in HTML5:
-        NETWORK_ERR = 19,
-        ABORT_ERR = 20,
-        URL_MISMATCH_ERR = 21,
-        QUOTA_EXCEEDED_ERR = 22,
-        TIMEOUT_ERR = 23,
-        INVALID_NODE_TYPE_ERR = 24,
-        DATA_CLONE_ERR = 25,
+        NETWORK_ERR,
+        ABORT_ERR,
+        URL_MISMATCH_ERR,
+        QUOTA_EXCEEDED_ERR,
+        TIMEOUT_ERR,
+        INVALID_NODE_TYPE_ERR,
+        DATA_CLONE_ERR,
 
         // WebIDL exception types, handled by the binding layer.
         // FIXME: Add GeneralError, EvalError, etc. when implemented in the bindings.