Reland: Don't store ScriptValue in PopStateEvent

Fix compilation errors (rebased).

Original description:

Use TraceWrapperV8Reference instead. This CL doesn't remove
custom getter of PopStateEvent.state as more work will be
needed to remove custom bindings.

BUG=501866

Review-Url: https://codereview.chromium.org/2850383002
Cr-Commit-Position: refs/heads/master@{#468582}
4 files changed