Revert 138014 - Base: Don't overwrite the thread id when ThreadMain exits. There's no need to do that, and it makes debugging easier to have the value.
Revert 138014 - Base: Don't overwrite the thread id when ThreadMain exits. There's
no need to do that, and it makes debugging easier to have the value.

BUG=127931
TEST=none
Review URL: https://chromiumcodereview.appspot.com/10388202

TBR=rvargas@google.com
Review URL: https://chromiumcodereview.appspot.com/10383256

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@138018 0039d316-1c4b-4281-b951-d872f2087c98

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