ScopedTaskSuspend test: remove extraneous CheckedReadFDAtEOF().
ScopedTaskSuspend test: remove extraneous CheckedReadFDAtEOF().

The base class takes care of this.

TEST=util_test ScopedTaskSuspend.ScopedTaskSuspend
R=rsesek@chromium.org

Review URL: https://codereview.chromium.org/659493002

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