Clean up webkit_param_traits.h to use SimilarTypeTraits for enums that don't have custom logic.
Clean up webkit_param_traits.h to use SimilarTypeTraits for enums that don't
have custom logic.

BUG=None
TEST=Compiles
Review URL: http://codereview.chromium.org/3333008

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@58368 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser