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Until now, we had to use IsSecureContext() to check whether an execution
context is a secure context manually. But we can use [SecureContext]
instead of the manual check now.

Bug: none
Change-Id: Ibfcd4a9a2eed3e7ac67819b9bf4204f4c73412d8
Reviewed-on: https://chromium-review.googlesource.com/990014Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Commit-Queue: Jinho Bang <jinho.bang@samsung.com>
Cr-Commit-Position: refs/heads/master@{#548464}