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

net/http/http_response_body_drainer_unittest.cc

Index: net/http/http_response_body_drainer_unittest.cc
diff --git a/net/http/http_response_body_drainer_unittest.cc b/net/http/http_response_body_drainer_unittest.cc
index ca206b7f5c7c71f2bdb9fb7d27d2de63608dfa40..f34f57fc5366dbef162c96c18703043c07108875 100644
--- a/net/http/http_response_body_drainer_unittest.cc
+++ b/net/http/http_response_body_drainer_unittest.cc
@@ -96,10 +96,9 @@ class MockHttpStream : public HttpStream {
     return ERR_UNEXPECTED;
   }
 
-  bool CanFindEndOfResponse() const override { return true; }
   bool IsConnectionReused() const override { return false; }
   void SetConnectionReused() override {}
-  bool IsConnectionReusable() const override { return false; }
+  bool CanReuseConnection() const override { return false; }
   int64 GetTotalReceivedBytes() const override { return 0; }
   void GetSSLInfo(SSLInfo* ssl_info) override {}
   void GetSSLCertRequestInfo(SSLCertRequestInfo* cert_request_info) override {}
@@ -118,8 +117,6 @@ class MockHttpStream : public HttpStream {
 
   bool IsResponseBodyComplete() const override { return is_complete_; }
 
-  bool IsSpdyHttpStream() const override { return false; }
-
   bool GetLoadTimingInfo(LoadTimingInfo* load_timing_info) const override {
     return false;
   }