[runtime] Use utils.InstallFunctions for Symbol.prototype[@@toPrimitive].
[runtime] Use utils.InstallFunctions for Symbol.prototype[@@toPrimitive].

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/1310163004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#30474}

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh