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through HTTPS Proxies.  This also changes the mechanism used 
to restart HttpProxyClientSocket requests with auth.  Previously
the transport socket would be Disconnected, and then re-Connected
(which was not implemented for SSLClientSockets).  However, the 
approach was problematic in the face of, for example, ipv6.  The
new approach is to close the HttpProxyClientSocket, and request
a new socket from the pool.

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=110529

Review URL: http://codereview.chromium.org/8502024

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@110879 0039d316-1c4b-4281-b951-d872f2087c98