Move SkReadBuffer.h and SkReader32.h out of include.

Committed: https://skia.googlesource.com/skia/+/2a51d7c74cec217195f861677de8998b382b39e4

R=mtklein@google.com, reed@google.com

Author: halcanary@google.com

Review URL: https://codereview.chromium.org/481053002
7 files changed