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 8435b2ba295c0134b0161968052a4f12685f3cc3..30f7926456946c5a3728ca9ee9a62427b25abb0b 100644
--- a/base/memory/shared_memory_nacl.cc
+++ b/base/memory/shared_memory_nacl.cc
@@ -133,14 +133,6 @@ void SharedMemory::Close() {
   }
 }
 
-void SharedMemory::LockDeprecated() {
-  NOTIMPLEMENTED();
-}
-
-void SharedMemory::UnlockDeprecated() {
-  NOTIMPLEMENTED();
-}
-
 bool SharedMemory::ShareToProcessCommon(ProcessHandle process,
                                         SharedMemoryHandle *new_handle,
                                         bool close_self,