Make --ignore-in-dtor=no the default ThreadSanitizer option.
Make --ignore-in-dtor=no the default ThreadSanitizer option.

My local bots (both Linux and Mac) were cycling green with this option all the last week
except for one real race (fixed tonight) and two benign reports suppressed recently.
This option will help us find more races, especially my beloved ref-counter races.

TEST=TSAN bots should remain green
Review URL: http://codereview.chromium.org/348020

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@30636 0039d316-1c4b-4281-b951-d872f2087c98

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