DevTools: migrate protocol values from RefPtr to OwnPtr.

BUG=580337

Review URL: https://codereview.chromium.org/1745423002

Cr-Original-Commit-Position: refs/heads/master@{#378575}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: e8903f001fe670d33ee3b34cc43fc8a5cb778509
12 files changed