Remove use of unique glyphs from the SkGlyphRunBuilder

I have determined that the uniquify calculation can only
happen when needed when regenerating the GrTextBlob data.

Change-Id: I142e6dedc3b2e6ab5d0b969a8e7c02deec32e912
Reviewed-on: https://skia-review.googlesource.com/c/165023
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Herb Derby <herb@google.com>
2 files changed