Remove SkAutoGlyphCache decls that happen to work

...and fix sample code.

Change-Id: I673770125064f8451e3d88ec4929a68409935ad1
Reviewed-on: https://skia-review.googlesource.com/115995
Reviewed-by: Ben Wagner <bungeman@google.com>
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Herb Derby <herb@google.com>
6 files changed