move SkICC::WriteToICC out of line

Change-Id: I03760e49437b82bc8faf76fa42ce876d618bf516
Reviewed-on: https://skia-review.googlesource.com/c/167680
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: Mike Klein <mtklein@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
2 files changed