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To access private properties of a V8 object, we need a v8::Private as a key for each property.  V8PrivateProperty provides its wrapper class "Symbol" as a shorthand API.

Currently, V8PrivateProperty has two types of APIs to get Symbol.  One is a macro-generated function, which needs to be managed by hand.  And the other is string-based mapping, which defers the management of the mapping to V8.

This CL adds a new API to get a Symbol (wired with a unique v8::Private) from a key pointer.  All the current Symbol getters will be replaced with this new API.
Also uses it to access private properties to keep-alive objects.

Bug: 715418, 1005601
Change-Id: I29735fdf5b8748c6dc7f57f91f8c5ebd5e5991b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1810511
Commit-Queue: Marina Sakai <marinasakai@google.com>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698417}