Make SkRemoteGlyphCache tests use private glyph cache

Change-Id: If6aa189f3badc7558ab8ecf71ee3d704b275b20f
Reviewed-on: https://skia-review.googlesource.com/136225
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
7 files changed