Make NumberFormat use the ICU currency data, fix bug in NumberFormat (Chromium issues 304722, 435465, 473104).

Properly fix enumerate / Object.keys wrt access checked objects (Chromium issue 509936).

Fix object enumeration wrt access checked objects (Chromium issue 509936).

Fix DefineOwnProperty for data properties wrt failed access checks (Chromium issue 509936).

Fix GetOwnPropertyNames on access-checked objects (Chromium issue 509936).

Fix getPrototypeOf for access checked objects (Chromium issue 509936).

Delete APIs deprecated since last release.

Performance and stability improvements on all platforms.

Cr-Commit-Position: refs/heads/4.6.15@{#1}
Cr-Branched-From: c9007d8f7ee634e99b3104233d7fcc2d64a18a52-refs/heads/master@{#29737}