Revert "Add some more PPAPI TCP tests."

This reverts commit a886f31ed796f5e053765a53be5403b1518aa157.

Reason for revert: Causing failures on Mac starting at
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Mac10.11%20Tests/28803

Other examples:
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Mac10.13%20Tests/4934
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Mac10.12%20Tests/15151

Original change's description:
> Add some more PPAPI TCP tests.
> 
> In particular, add some tests for various errors and state transitions,
> and make sure reading from a closed socket returns net::OK on the first
> read.
> 
> This CL also splits up the PPAPI TcpSocket browser test into multiple
> tests to decrease the chance of the tests timing out.
> 
> Bug: 848078
> Change-Id: I308cfa0ac60db63ada4a41dce8d93e68393600ff
> Reviewed-on: https://chromium-review.googlesource.com/1197924
> Commit-Queue: Matt Menke <mmenke@chromium.org>
> Reviewed-by: Bill Budge <bbudge@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#588092}

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

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 848078
Change-Id: I3bdecc1e754da5d14cf184b5e285a6db3ec21362
Reviewed-on: https://chromium-review.googlesource.com/1201629
Reviewed-by: calamity <calamity@chromium.org>
Commit-Queue: calamity <calamity@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#588333}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 79e8e426a348aaecfb817065f217383c5d348606
3 files changed