Re-sort declarations in StyleResolver.h and remove redundant public/private labels

BUG=237268
R=pdr@chromium.org

Review URL: https://codereview.chromium.org/19441002

git-svn-id: svn://svn.chromium.org/blink/trunk@154335 bbb929c8-8fbe-4397-9dbb-9b2b20218538