V8ValueConverter::ToV8Value should not trigger setters

BUG=606390

Review URL: https://codereview.chromium.org/1918793003

Cr-Commit-Position: refs/heads/master@{#390045}
(cherry picked from commit b5bdf3778209179111c9f865af00940e74aa20e7)

Review URL: https://codereview.chromium.org/1930953002 .

Cr-Commit-Position: refs/branch-heads/2704@{#286}
Cr-Branched-From: 6e53600def8f60d8c632fadc70d7c1939ccea347-refs/heads/master@{#386251}
2 files changed