Remove SkPackedID

Since the unichar to X system has been removed from SkStrike, there
is no need for having SkPackedID be a super class of the last remaining
class SkPackedGlyphID.

+ misc cleanups

Change-Id: I796cdff83b745ac0443df27b1ab56909226e72d3
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/215605
Commit-Queue: Mike Klein <mtklein@google.com>
Auto-Submit: Herb Derby <herb@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
1 file changed