Don't valgrind the ProcessSingletonLinuxTest tests which use kill -9.
Don't valgrind the ProcessSingletonLinuxTest tests which use kill -9.

These tests (NotifyOtherProcessFailure and NotifyOtherProcessDifferingHost) involve killing the browser process, which under valgrind leaves incomplete valgrind output.

BUG=25176
TEST="tools/valgrind/chrome_tests.sh -t ui --gtest_filter=ProcessSingletonLinuxTest.\*" should not output any valgrind warnings.

Review URL: http://codereview.chromium.org/460003

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@33618 0039d316-1c4b-4281-b951-d872f2087c98

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