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

mojo/edk/system/memory_unittest.cc

Index: mojo/edk/system/memory_unittest.cc
diff --git a/third_party/mojo/src/mojo/edk/system/memory_unittest.cc b/mojo/edk/system/memory_unittest.cc
similarity index 99%
copy from third_party/mojo/src/mojo/edk/system/memory_unittest.cc
copy to mojo/edk/system/memory_unittest.cc
index 46515c0cf6f0cce41baaa500dbddc5370a109246..15492f25b977893fea10fade3604779698735feb 100644
--- a/third_party/mojo/src/mojo/edk/system/memory_unittest.cc
+++ b/mojo/edk/system/memory_unittest.cc
@@ -13,7 +13,7 @@
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
-namespace system {
+namespace edk {
 namespace {
 
 TEST(MemoryTest, Valid) {
@@ -290,5 +290,5 @@ TEST(MemoryTest, InvalidDeath) {
 }
 
 }  // namespace
-}  // namespace system
+}  // namespace edk
 }  // namespace mojo