Enable SequencedSocketDataTest.SingleSyncWriteTooSmall test.
Enable SequencedSocketDataTest.SingleSyncWriteTooSmall test.

SequencedSocketDataTest.SingleSyncWriteTooSmall confirms that errors will be generated when the SequencedSocketData provider is set up with too large write expectations.

The test was previously disabled because it used EXPECT_NONFATAL_FAILURE to do the confirmation. EXPECT_NONFATAL_FAILURE can only handle one failure, and this error case generates three.

There is not a comparable macro for multiple failures in the gtest framework, but tests can directly access the failures using the TestPartResultArray data structure and the ScopedFakeTestPartResultReporter to capture the failures.

BUG=488072

Review URL: https://codereview.chromium.org/1158573004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#332420}

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