Add base::HostToNetXX() & NetToHostXX(), and use them to replace htonX() & ntohX() in Chrome.

net/spdy/spdy_framer_test.cc

Index: net/spdy/spdy_framer_test.cc
diff --git a/net/spdy/spdy_framer_test.cc b/net/spdy/spdy_framer_test.cc
index a2f29bf490be64f9eb219c12df33986fe861c401..7ebf538fa428dad50af1d405f75b0b6ee95dbb88 100644
--- a/net/spdy/spdy_framer_test.cc
+++ b/net/spdy/spdy_framer_test.cc
@@ -2610,7 +2610,7 @@ TEST_P(SpdyFramerTest, SettingsFlagsAndId) {
   const uint32 kId = 0x020304;
   const uint32 kFlags = 0x01;
   const uint32 kWireFormat =
-      htonl(IsSpdy2() ? 0x04030201 : 0x01020304);
+      base::HostToNet32(IsSpdy2() ? 0x04030201 : 0x01020304);
 
   SettingsFlagsAndId id_and_flags =
       SettingsFlagsAndId::FromWireFormat(spdy_version_, kWireFormat);