SkDrawCommand cleanup, continued

- Removes all remaining manual memory management

Change-Id: I3e9ed4e186082a13b46a2d2de295cbeb0cf9a449
Reviewed-on: https://skia-review.googlesource.com/130542
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
2 files changed