Make CSSSelector::specificityForOneSelector more clear.
Make CSSSelector::specificityForOneSelector more clear.

The fallthrough was confusing, lets group the pseudo class cases together.
This also removes the branch about PseudoNot from the common path for
classes.

I also expanded the bit patterns for the various cases to all by 6 components
wide so it's easier to see what this code is doing.

Review URL: https://codereview.chromium.org/1132653002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@195101 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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