Add a Mojo EDK for Chrome that uses one OS pipe per message pipe.

mojo/edk/system/handle_table.cc

Index: mojo/edk/system/handle_table.cc
diff --git a/third_party/mojo/src/mojo/edk/system/handle_table.cc b/mojo/edk/system/handle_table.cc
similarity index 99%
copy from third_party/mojo/src/mojo/edk/system/handle_table.cc
copy to mojo/edk/system/handle_table.cc
index 15ff5d8f8eebfa415778d4291d342776e59e2dd5..a9774c865913819a53bc86939a68cecd1c26108f 100644
--- a/third_party/mojo/src/mojo/edk/system/handle_table.cc
+++ b/mojo/edk/system/handle_table.cc
@@ -11,7 +11,7 @@
 #include "mojo/edk/system/dispatcher.h"
 
 namespace mojo {
-namespace system {
+namespace edk {
 
 HandleTable::Entry::Entry() : busy(false) {
 }
@@ -239,5 +239,5 @@ void HandleTable::RestoreBusyHandles(const MojoHandle* handles,
   }
 }
 
-}  // namespace system
+}  // namespace edk
 }  // namespace mojo