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This patch implements SafeBundledExchangesParser and
BundledExchangesReader.

SafeBundledExchangesParser manages remote BundledExchangesParser
interface to communicate with data_decoder service in a reliable way.

BundledExchangesReader uses this trusted parser implementation
and provides functionalities to read BundledExchanges resource
in the browser process.

In this patch, BundledExchangesFactory uses the reader interface
to obtain the initial redirect URL.

Bug: 966753
Change-Id: I0a03237141bea9639a0cbeac4ae085a87fac6c08
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1712792Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Chris Palmer <palmer@chromium.org>
Reviewed-by: Kunihiko Sakamoto <ksakamoto@chromium.org>
Reviewed-by: Tsuyoshi Horo <horo@chromium.org>
Commit-Queue: Takashi Toyoshima <toyoshim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682611}