PATCH: Make use of expected outcomes in result streams more convenient

[Mark Mitchell]

This patch adds a _GetExpectedOutcome conveience method to ResultStream.
 When ResultStreams are constructed, they are provided with the current
list of expected test outcomes, if that list is available.  The intended
semantics are that if no expectation is available, the expectation is
PASS by default.  This new method encapsulates this information in a
single place, so that various result stream classes can behave consistently.

Committed.

-- 
Mark Mitchell
CodeSourcery, LLC
mark at codesourcery.com
(916) 791-8304
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