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

mojo/edk/system/awakable_list.cc

Index: mojo/edk/system/awakable_list.cc
diff --git a/third_party/mojo/src/mojo/edk/system/awakable_list.cc b/mojo/edk/system/awakable_list.cc
similarity index 98%
copy from third_party/mojo/src/mojo/edk/system/awakable_list.cc
copy to mojo/edk/system/awakable_list.cc
index 82fd19afa2d20f879868dd053f9c1b41092482e2..84f7e45ac7f7800721883e64e92905854da9869b 100644
--- a/third_party/mojo/src/mojo/edk/system/awakable_list.cc
+++ b/mojo/edk/system/awakable_list.cc
@@ -11,7 +11,7 @@
 #include "mojo/edk/system/handle_signals_state.h"
 
 namespace mojo {
-namespace system {
+namespace edk {
 
 AwakableList::AwakableList() {
 }
@@ -70,5 +70,5 @@ void AwakableList::Remove(Awakable* awakable) {
   awakables_.erase(last, awakables_.end());
 }
 
-}  // namespace system
+}  // namespace edk
 }  // namespace mojo