Remove SkRemoteGlyphCacheImpl.h

Move everything to SkRemoteGlyphCache.cpp. Add a call
to SkStrikeServer (AddGlyphForTest), to make tests work.
* Misc cleanups

Change-Id: I22bea686838f60cf96d097e1ea025cb5399903e7
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/235096
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Herb Derby <herb@google.com>
6 files changed