Move CreateTypefaceFromHFont helper to SkiaFontWin.cpp

Move the CreateTypefaceFromHFont helper method from FontPlatformDataWin
to SkiaFontWin next to where it is used and mark it as inline. No need
to export a helper only used in a single place.

R=dglazkov@chromium.org
BUG=

Review URL: https://codereview.chromium.org/181003003

git-svn-id: svn://svn.chromium.org/blink/trunk@167925 bbb929c8-8fbe-4397-9dbb-9b2b20218538