refactoring for SK_FONTHOST_USES_FONTMGR option

BUG=
R=bungeman@google.com

Review URL: https://codereview.chromium.org/21149008

git-svn-id: http://skia.googlecode.com/svn/trunk@10440 2bbb7eff-a529-9590-31e7-b0007b416f81
7 files changed