Remove redundant findImage, and remove glyph cache plumbing

Change-Id: I2dd8231b4159afa15604fe533f9e4cd00d20a420
Reviewed-on: https://skia-review.googlesource.com/c/174800
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Herb Derby <herb@google.com>
4 files changed