Adding method to create process using LowBox token in sandbox code.

base/memory/shared_memory_win.cc

Index: base/memory/shared_memory_win.cc
diff --git a/base/memory/shared_memory_win.cc b/base/memory/shared_memory_win.cc
index 20659ab97af7b1d3220c077d69435146db226f3e..8514d708d2510d7e6313101bceb5c6b84452ca3b 100644
--- a/base/memory/shared_memory_win.cc
+++ b/base/memory/shared_memory_win.cc
@@ -143,8 +143,10 @@ bool SharedMemory::Create(const SharedMemoryCreateOptions& options) {
                          rand_values[0], rand_values[1],
                          rand_values[2], rand_values[3]);
   }
+
   mapped_file_ = CreateFileMapping(INVALID_HANDLE_VALUE, &sa,
-      PAGE_READWRITE, 0, static_cast<DWORD>(rounded_size), name_.c_str());
+      PAGE_READWRITE, 0, static_cast<DWORD>(rounded_size),
+      name_.empty() ? nullptr : name_.c_str());
   if (!mapped_file_)
     return false;