GitLab

This reverts commit 45fb6502.

Reason for revert: Test failure: crbug.com/1051400

Original change's description:
> PPAPI:  Add NetworkIsolationKeys to proxy lookup requests.
> 
> This is needed to correctly isolate any DNS requests made by PPAPI in
> the context of one page from those made in the context of other pages.
> 
> This is a reland of
> https://chromium-review.googlesource.com/c/chromium/src/+/2008050. The
> original CL was reverted because the DNS layer auto-detects whether the
> current network supports IPv6, and the detection value was changing in
> the middle of tests. When the value changes, the cache key used for the
> DNS layer changes, which was resulting in cache misses.
> 
> To fix the issue, the test now relies on IPv4 DNS lookups, which don't
> have this issue.
> 
> Bug: 1021661
> Change-Id: I959b81d0a3fc5973cde4ba7a0ccfd0c501ffc235
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2050743
> Commit-Queue: Matt Menke <mmenke@chromium.org>
> Reviewed-by: Raymes Khoury <raymes@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#740487}

TBR=raymes@chromium.org,mmenke@chromium.org

Change-Id: I40432831baa19cdf040c38684fb785f48816873f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1021661
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2051644Reviewed-by: Hajime Hoshi <hajimehoshi@chromium.org>
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#740580}