Close idle H2 sockets when SpdySession is initialized.

net/socket/client_socket_pool_base.h

Index: net/socket/client_socket_pool_base.h
diff --git a/net/socket/client_socket_pool_base.h b/net/socket/client_socket_pool_base.h
index f221f8e330ca39fbf575832ae7a5f73d2d2794bf..d676153040af4814661051be542da6140af02d09 100644
--- a/net/socket/client_socket_pool_base.h
+++ b/net/socket/client_socket_pool_base.h
@@ -288,6 +288,9 @@ class NET_EXPORT_PRIVATE ClientSocketPoolBaseHelper
   // See ClientSocketPool::CloseIdleSockets for documentation on this function.
   void CloseIdleSockets();
 
+  // See ClientSocketPool::CloseIdleSocketsInGroup for documentation.
+  void CloseIdleSocketsInGroup(const std::string& group_name);
+
   // See ClientSocketPool::IdleSocketCount() for documentation on this function.
   int idle_socket_count() const {
     return idle_socket_count_;
@@ -527,6 +530,13 @@ class NET_EXPORT_PRIVATE ClientSocketPoolBaseHelper
   typedef std::map<const ClientSocketHandle*, CallbackResultPair>
       PendingCallbackMap;
 
+  // Closes all idle sockets in |group| if |force| is true.  Else, only closes
+  // idle sockets in |group| that timed out with respect to |now| or can't be
+  // reused.
+  void CleanupIdleSocketsInGroup(bool force,
+                                 Group* group,
+                                 const base::TimeTicks& now);
+
   Group* GetOrCreateGroup(const std::string& group_name);
   void RemoveGroup(const std::string& group_name);
   void RemoveGroup(GroupMap::iterator it);
@@ -790,6 +800,10 @@ class ClientSocketPoolBase {
 
   void CloseIdleSockets() { return helper_.CloseIdleSockets(); }
 
+  void CloseIdleSocketsInGroup(const std::string& group_name) {
+    return helper_.CloseIdleSocketsInGroup(group_name);
+  }
+
   int idle_socket_count() const { return helper_.idle_socket_count(); }
 
   int IdleSocketCountInGroup(const std::string& group_name) const {