[cleanup] Fix use of deprecated v8 method in chrome/renderer

Uses Int32Value(Local<Context>) instead of deprecated Value::Int32Value.

Adds const modifiier to gin::arguments::GetHolderCreationContext.

Change-Id: I90b06eaedb6684c91e349bc4801f02f5a3fe5654
Reviewed-on: https://chromium-review.googlesource.com/1152973
Reviewed-by: Ross McIlroy <[email protected]>
Reviewed-by: Matt Menke <[email protected]>
Commit-Queue: Dan Elphick <[email protected]>
Cr-Commit-Position: refs/heads/master@{#579008}
3 files changed