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This is in preparation for adding and using base::RefCountedShm to avoid
copying data from base::SharedMemory. All the printing code being
changed only needs the generic base::RefCountedMemory interface and do
not specifically need base::RefCountedBytes.

Also fix most lint errors.

Change-Id: I4071b869e75350d922bcb7077aeda269df59ee12
Reviewed-on: https://chromium-review.googlesource.com/978649
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Wei Li <weili@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545685}