Replace std::map, std::set by WTF::HashMap and WTF::HashSet.
Replace std::map, std::set by WTF::HashMap and WTF::HashSet.

WebKit gurus, please review the change carefully, WTF::HashMap interface is not well documented, so I have implement
customized hash functions and HashTraits in order to use StringKey as the hash key.

Review URL: http://codereview.chromium.org/100069

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@14995 0039d316-1c4b-4281-b951-d872f2087c98

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