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We are planning to replace snapshot_blob.bin with v8_context_snapshot.bin.
This CL makes net/ code to load v8_context_snapshot.bin to work with it.

Bug: 789964, 764576
Change-Id: Ifcbe58d632dd76fd4bcc02182044d1e111f4267a
Reviewed-on: https://chromium-review.googlesource.com/810347Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Hitoshi Yoshida <peria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522648}