Make the default alternate protcol probability threshold 1, not 0.

net/http/http_server_properties_impl_unittest.cc

Index: net/http/http_server_properties_impl_unittest.cc
diff --git a/net/http/http_server_properties_impl_unittest.cc b/net/http/http_server_properties_impl_unittest.cc
index f21c9692f255e4b5228fa474660d3828cfa818a6..c2c4aef35091fbbc8fef683fe0b522509c7906ff 100644
--- a/net/http/http_server_properties_impl_unittest.cc
+++ b/net/http/http_server_properties_impl_unittest.cc
@@ -254,6 +254,13 @@ TEST_F(AlternateProtocolServerPropertiesTest, Basic) {
   EXPECT_FALSE(impl_.HasAlternateProtocol(test_host_port_pair));
 }
 
+TEST_F(AlternateProtocolServerPropertiesTest, DefaultProbabilityExcluded) {
+  HostPortPair test_host_port_pair("foo", 80);
+  impl_.SetAlternateProtocol(test_host_port_pair, 443, NPN_SPDY_3, .99);
+
+  EXPECT_FALSE(impl_.HasAlternateProtocol(test_host_port_pair));
+}
+
 TEST_F(AlternateProtocolServerPropertiesTest, Probability) {
   impl_.SetAlternateProtocolProbabilityThreshold(.25);