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

chrome/common/metrics/metrics_log_base.cc

Index: chrome/common/metrics/metrics_log_base.cc
diff --git a/chrome/common/metrics/metrics_log_base.cc b/chrome/common/metrics/metrics_log_base.cc
index fc0c768de93cb08c8f254b311778f0f4916831b3..09d1a84e371c1c5afe1a8af38f89f6464abb2238 100644
--- a/chrome/common/metrics/metrics_log_base.cc
+++ b/chrome/common/metrics/metrics_log_base.cc
@@ -43,7 +43,7 @@ inline uint64 HashToUInt64(const std::string& hash) {
   uint64 value;
   DCHECK_GE(hash.size(), sizeof(value));
   memcpy(&value, hash.data(), sizeof(value));
-  return base::htonll(value);
+  return base::HostToNet64(value);
 }
 
 // Creates an MD5 hash of the given value, and returns hash as a byte buffer