Use correct origin when prompting for proxy authentication.

net/base/auth.cc

Index: net/base/auth.cc
diff --git a/net/base/auth.cc b/net/base/auth.cc
index 332e1883855873618a4261feebd1c63f17e9cf57..13ab1edfa8cef2aa2f71a16df86c7515508e1819 100644
--- a/net/base/auth.cc
+++ b/net/base/auth.cc
@@ -12,8 +12,7 @@ AuthChallengeInfo::AuthChallengeInfo() : is_proxy(false) {
 
 bool AuthChallengeInfo::Equals(const AuthChallengeInfo& that) const {
   return (this->is_proxy == that.is_proxy &&
-          this->challenger.Equals(that.challenger) &&
-          this->scheme == that.scheme &&
+          this->challenger == that.challenger && this->scheme == that.scheme &&
           this->realm == that.realm);
 }