Revert 58786 - Adding debugging info for thread name.
Revert 58786 - Adding debugging info for thread name.

This temporary instrumentation has already yielded the intended data, so it is no longer necessary.

BUG=54307

Review URL: http://codereview.chromium.org/3337012

TBR=huanr@chromium.org
Review URL: http://codereview.chromium.org/3322020

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@59178 0039d316-1c4b-4281-b951-d872f2087c98

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