Move logic to figure out if a socket can be reused into HttpStream.

net/http/proxy_connect_redirect_http_stream.h

Index: net/http/proxy_connect_redirect_http_stream.h
diff --git a/net/http/proxy_connect_redirect_http_stream.h b/net/http/proxy_connect_redirect_http_stream.h
index 701d18d425a0be30f8fc081793024b3871c405c3..e268ebf67c62b0134ee4743fd26159fa0b7c816b 100644
--- a/net/http/proxy_connect_redirect_http_stream.h
+++ b/net/http/proxy_connect_redirect_http_stream.h
@@ -42,12 +42,9 @@ class ProxyConnectRedirectHttpStream : public HttpStream {
 
   bool IsResponseBodyComplete() const override;
 
-  // This function may be called.
-  bool CanFindEndOfResponse() const override;
-
   bool IsConnectionReused() const override;
   void SetConnectionReused() override;
-  bool IsConnectionReusable() const override;
+  bool CanReuseConnection() const override;
 
   int64 GetTotalReceivedBytes() const override;
 
@@ -56,7 +53,6 @@ class ProxyConnectRedirectHttpStream : public HttpStream {
 
   void GetSSLInfo(SSLInfo* ssl_info) override;
   void GetSSLCertRequestInfo(SSLCertRequestInfo* cert_request_info) override;
-  bool IsSpdyHttpStream() const override;
   void Drain(HttpNetworkSession* session) override;
 
   // This function may be called.