Remove unncessary forward declarations from CSSPropertyParser.h
Remove unncessary forward declarations from CSSPropertyParser.h

Some of the forward declarations are not necessary, hence removing them.

BUG: None

Review URL: https://codereview.chromium.org/363643003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@177344 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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