Revert "Take desktop screenshots after test failures in test_runner.py."

Revert "Take desktop screenshots after test failures in test_runner.py."

This reverts commit 54548ddbe9febbe12dafb3178811a0c86b0636f7.

Reason for revert:
Likely to have caused a significant regression in net_unittests cycle time, which is producing a long pending queue on ios-simulator, which in turn is blocking the entire commit queue.

BUG=706609
TBR=baxley

Review-Url: https://codereview.chromium.org/2779213004 .
Cr-Commit-Position: refs/heads/master@{#460567}
Committed: https://chromium.googlesource.com/chromium/src/+/73bfc0e7d25c0f6f2c2c8320877434896d7434cb

[smut, 2017-03-29 23:08:31]

Description was changed from

==========
Revert "Take desktop screenshots after test failures in test_runner.py."

This reverts commit 54548ddbe9febbe12dafb3178811a0c86b0636f7.

Reason for revert:
Likely to have caused a significant regression in net_unittests cycle time,
which is producing a long pending queue on ios-simulator, which in turn is
blocking the entire commit queue.

BUG=706609
TBR=baxley
==========

to

==========
Revert "Take desktop screenshots after test failures in test_runner.py."

This reverts commit 54548ddbe9febbe12dafb3178811a0c86b0636f7.

Reason for revert:
Likely to have caused a significant regression in net_unittests cycle time,
which is producing a long pending queue on ios-simulator, which in turn is
blocking the entire commit queue.

BUG=706609
TBR=baxley

Review-Url: https://codereview.chromium.org/2779213004 .
Cr-Commit-Position: refs/heads/master@{#460567}
Committed:
https://chromium.googlesource.com/chromium/src/+/73bfc0e7d25c0f6f2c2c83208774...
==========

[smut, 2017-03-29 23:08:32]

Committed patchset #1 (id:1) manually as
73bfc0e7d25c0f6f2c2c8320877434896d7434cb.

[baxley, 2017-03-30 13:27:48]

lgtm