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[This change was shipping to dev/canary over the past
weekend, and had no impact on buildability.  I'm landing
this yet again since the bug has a large impact on XP
users, and we need it tested in the field if we are
going to push it to M16 in the new year]


This code should only have much of an impact on the XP
platform, where thread teardown notification are not
currently made.

Provide an automatic fallback scan of the linker
list of notifcation callbacks via DllMain.

This fallback is ONLY used if there are no notifications
coming via the linker list. This allows all existing
code to continue working as it does today, and provides
thread teardown notifcatino on XP even though we use
the LoadLibrary call.

It is a minimal change, suitable for pushing to other
channels (beta? stable?).

r=cpu
BUG=103209
Review URL: http://codereview.chromium.org/8836003

TBR=jar@chromium.org
Review URL: http://codereview.chromium.org/8934006

TBR=jar@chromium.org
Review URL: http://codereview.chromium.org/8964002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@114672 0039d316-1c4b-4281-b951-d872f2087c98