[mojo-edk] Disable sync broker shared memory creation on Mac.

mojo/edk/system/node_controller.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/edk/system/node_controller.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/bind.h"
@@ skipping 174 matching lines @@
     parent->RequestPortMerge(port.name(), token);
     return;
   }
 
   base::AutoLock lock(pending_port_merges_lock_);
   pending_port_merges_.push_back(std::make_pair(token, port));
 }
 
 scoped_refptr<PlatformSharedBuffer> NodeController::CreateSharedBuffer(
     size_t num_bytes) {
-#if defined(OS_POSIX)
+  // TODO(amistry): Fix sync broker and re-enable on OSX.
+#if defined(OS_POSIX) && !defined(OS_MACOSX)
   // Shared buffer creation failure is fatal, so always use the broker when we
   // have one. This does mean that a non-root process that has children will use
   // the broker for shared buffer creation even though that process is
   // privileged.
   if (broker_) {
     return broker_->GetSharedBuffer(num_bytes);
   }
 #endif
   return PlatformSharedBuffer::Create(num_bytes);
 }
@@ skipping 671 matching lines @@
     shutdown_callback_.Reset();
   }
 
   DCHECK(!callback.is_null());
 
   callback.Run();
 }
 
 }  // namespace edk
 }  // namespace mojo