Remove unused locking functionality from base::SharedMemory.

base/memory/shared_memory_nacl.cc

Index: base/memory/shared_memory_nacl.cc
diff --git a/base/memory/shared_memory_nacl.cc b/base/memory/shared_memory_nacl.cc
index 26dd4a380d6b02660e51c43a2af85ca6f5e23cec..4a1fa11141bf7adc06db9b5797ef0d5a7599ceff 100644
--- a/base/memory/shared_memory_nacl.cc
+++ b/base/memory/shared_memory_nacl.cc
@@ -139,14 +139,6 @@ void SharedMemory::Close() {
   }
 }
 
-void SharedMemory::LockDeprecated() {
-  NOTIMPLEMENTED();
-}
-
-void SharedMemory::UnlockDeprecated() {
-  NOTIMPLEMENTED();
-}
-
 bool SharedMemory::ShareToProcessCommon(ProcessHandle process,
                                         SharedMemoryHandle *new_handle,
                                         bool close_self,