Handles proxy authentication request in ProxyResolvingClientSocket. This will make the WebRTC connection work under NTLM/Kerberos using the default credential without prompting the user.

BUG=395614

Review URL: https://codereview.chromium.org/414523005

Cr-Commit-Position: refs/heads/master@{#292428}
(cherry picked from commit 260631aa62e2096045adb0e3780ef562ef12bb4f)

Review URL: https://codereview.chromium.org/543293002

Cr-Commit-Position: refs/branch-heads/2125@{#251}
Cr-Branched-From: b68026d94bda36dd106a3d91a098719f952a9477-refs/heads/master@{#290040}
1 file changed