Make ConditionVariableTest.MultiThreadConsumerTest less flaky.
Make ConditionVariableTest.MultiThreadConsumerTest less flaky.

Remove the code that tests that Signal() will wake up just one thread.
According to base/synchronization/condition_variable.h, "there can/will be
spurious signals.". One reason for this is explained in the linux man page
for pthread_cond_signal: "The pthread_cond_signal() function shall unblock
*at least one* of the threads" and "On a multi-processor, it may be
impossible for an implementation of pthread_cond_signal() to avoid the
unblocking of more than one thread blocked on a condition variable."

BUG=10607
TEST=ConditionVariableTest.MultiThreadConsumerTest


Review URL: http://codereview.chromium.org/9309055

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@120573 0039d316-1c4b-4281-b951-d872f2087c98

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