Allow SpdySessionPool to find/create SpdySession with IP pooling disabled.

net/spdy/spdy_session.h

Index: net/spdy/spdy_session.h
diff --git a/net/spdy/spdy_session.h b/net/spdy/spdy_session.h
index 9852e2d6e33b2b7b579520b84204c43aa8bab03b..d6f03c367ab0232bf77e5633d318d978c1d7f2a2 100644
--- a/net/spdy/spdy_session.h
+++ b/net/spdy/spdy_session.h
@@ -532,6 +532,9 @@ class NET_EXPORT SpdySession : public BufferedSpdyFramerVisitorInterface,
   // Adds |alias| to set of aliases associated with this session.
   void AddPooledAlias(const SpdySessionKey& alias_key);
 
+  // Removes |alias| from set of aliases associated with this session.
+  void RemovePooledAlias(const SpdySessionKey& alias_key);
+
   // Returns the set of aliases associated with this session.
   const std::set<SpdySessionKey>& pooled_aliases() const {
     return pooled_aliases_;