net: use IsSecureScheme rather than matching "https".

net/http/http_proxy_client_socket_pool_spdy2_unittest.cc

Index: net/http/http_proxy_client_socket_pool_spdy2_unittest.cc
diff --git a/net/http/http_proxy_client_socket_pool_spdy2_unittest.cc b/net/http/http_proxy_client_socket_pool_spdy2_unittest.cc
index 630693f690e4fa1640c7c96541fa32708f86b8f0..bef9ec5138f86127b4edef0bf2fbeef6bab61206 100644
--- a/net/http/http_proxy_client_socket_pool_spdy2_unittest.cc
+++ b/net/http/http_proxy_client_socket_pool_spdy2_unittest.cc
@@ -483,7 +483,7 @@ TEST_P(HttpProxyClientSocketPoolSpdy2Test, TunnelUnexpectedClose) {
     // returns ERR_CONNECTION_CLOSED in this case.
     EXPECT_EQ(ERR_CONNECTION_CLOSED, callback_.WaitForResult());
   } else {
-    EXPECT_EQ(ERR_HEADERS_TRUNCATED, callback_.WaitForResult());
+    EXPECT_EQ(ERR_RESPONSE_HEADERS_TRUNCATED, callback_.WaitForResult());
   }
   EXPECT_FALSE(handle_.is_initialized());
   EXPECT_FALSE(handle_.socket());