Mange ciricular reference to HttpNetworkTransaction in HttpProxyClientSocktPool.

Without explicit management of the cirucular reference to HttpNetworkTransaction, it can get deleted at inopportune times and cause undesirable effects (i.e. triggering a pool to delete itself while in the middle of other operations).  This change breaks the cirucular reference at points in execution where it is safe.

BUG=50822, 49254
TEST=green reliability bot

Review URL: http://codereview.chromium.org/3084011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@54715 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed