DevTools: migrate from OwnPtr to std::unique_ptr for inspector protocol classes.

BUG=580337
NOTRY=true

Review-Url: https://codereview.chromium.org/2004313003
Cr-Original-Commit-Position: refs/heads/master@{#395765}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 229b1f8945646f00a834ec88bc97fe738561ff0a
18 files changed