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

mojo/edk/system/mapping_table.cc

Index: mojo/edk/system/mapping_table.cc
diff --git a/third_party/mojo/src/mojo/edk/system/mapping_table.cc b/mojo/edk/system/mapping_table.cc
similarity index 88%
copy from third_party/mojo/src/mojo/edk/system/mapping_table.cc
copy to mojo/edk/system/mapping_table.cc
index 693e8d79590a57032e92a34addec1c8a8c8ab5c9..717127e5ac55e723793e167b50c7ada80a7483af 100644
--- a/third_party/mojo/src/mojo/edk/system/mapping_table.cc
+++ b/mojo/edk/system/mapping_table.cc
@@ -9,7 +9,7 @@
 #include "mojo/edk/system/configuration.h"
 
 namespace mojo {
-namespace system {
+namespace edk {
 
 MappingTable::MappingTable() {
 }
@@ -20,7 +20,7 @@ MappingTable::~MappingTable() {
 }
 
 MojoResult MappingTable::AddMapping(
-    scoped_ptr<embedder::PlatformSharedBufferMapping> mapping) {
+    scoped_ptr<PlatformSharedBufferMapping> mapping) {
   DCHECK(mapping);
 
   if (address_to_mapping_map_.size() >=
@@ -38,11 +38,11 @@ MojoResult MappingTable::RemoveMapping(uintptr_t address) {
   AddressToMappingMap::iterator it = address_to_mapping_map_.find(address);
   if (it == address_to_mapping_map_.end())
     return MOJO_RESULT_INVALID_ARGUMENT;
-  embedder::PlatformSharedBufferMapping* mapping_to_delete = it->second;
+  PlatformSharedBufferMapping* mapping_to_delete = it->second;
   address_to_mapping_map_.erase(it);
   delete mapping_to_delete;
   return MOJO_RESULT_OK;
 }
 
-}  // namespace system
+}  // namespace edk
 }  // namespace mojo