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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. After this change, all related APIs
including PaymentRequest will not be exposed in non-secure context.

Bug: none
Change-Id: Ie5b3fc6641e882cc2844595fea350b6adb3425db
Reviewed-on: https://chromium-review.googlesource.com/818594Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Commit-Queue: Jinho Bang <jinho.bang@samsung.com>
Cr-Commit-Position: refs/heads/master@{#548425}