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Some of the StyleBuilderFunctions handlers were being defined in
StyleBuilder.cpp. This patch cleans moves them to the correct place and
makes some minor clean-ups inside (removing the unused condition check
and a redundant isPrimitiveValue check).

Review URL: https://codereview.chromium.org/236763002

git-svn-id: svn://svn.chromium.org/blink/trunk@171443 bbb929c8-8fbe-4397-9dbb-9b2b20218538