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Change deprecated V8 API calls to use non-deprecated versions

Change the soon to be deprecated API calls to use the alternate
non-deprecated versions in set_icon_natives.cc

Bug: v8:8238
Change-Id: I5b2365fe09bb89dcce5a52979823faee141c5070
Reviewed-on: https://chromium-review.googlesource.com/c/1349696Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Commit-Queue: Mythri Alle <mythria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611058}