Disable verbose logging for sync integration tests.
Disable verbose logging for sync integration tests.

The chromium buildbots were showing an increasing number of browser
crashes while running the sync integration tests. These crashes were
fixed by reverting r76345 and r76239, and by the new patch in r76989.

This patch disables verbose logging, now that the root cause of the
crashes were identified.

BUG=74467
TEST=sync_integration_tests

Review URL: http://codereview.chromium.org/6588068

TBR=rsimha@chromium.org
Review URL: http://codereview.chromium.org/6624038

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@77025 0039d316-1c4b-4281-b951-d872f2087c98

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