Refine the tool so that, it binary searches for the extensions that crashes the browser (if there is one).
Refine the tool so that, it binary searches for the extensions that crashes the browser (if there is one).

Review URL: http://codereview.chromium.org/3060021

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@54391 0039d316-1c4b-4281-b951-d872f2087c98

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