Get rid of IDL attribute "DontDelete".  It is only used for "v8DisallowShadowing", so fold into that. Also, it causes confusion when comparing to JSC's "Deletable" attribute.
Get rid of IDL attribute "DontDelete".  It is only used for "v8DisallowShadowing", so fold into that.
Also, it causes confusion when comparing to JSC's "Deletable" attribute.

Review URL: http://codereview.chromium.org/40210

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@11113 0039d316-1c4b-4281-b951-d872f2087c98

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