Remove MOJO_DISALLOW_COPY_AND_ASSIGN and MOJO_ALLOW_UNUSED_LOCAL.

mojo/public/cpp/system/macros.h

Index: mojo/public/cpp/system/macros.h
diff --git a/mojo/public/cpp/system/macros.h b/mojo/public/cpp/system/macros.h
index d477891be4accae90f647c4666989a23f24fbfc6..979b57b73f024d4e29e7c5064a1430e96c78b4df 100644
--- a/mojo/public/cpp/system/macros.h
+++ b/mojo/public/cpp/system/macros.h
@@ -13,11 +13,6 @@
 
 #include "mojo/public/c/system/macros.h"  // Symbols exposed.
 
-// A macro to disallow the copy constructor and operator= functions.
-#define MOJO_DISALLOW_COPY_AND_ASSIGN(TypeName) \
-  TypeName(const TypeName&) = delete;           \
-  void operator=(const TypeName&) = delete
-
 // Used to calculate the number of elements in an array.
 // (See |arraysize()| in Chromium's base/macros.h for more details.)
 namespace mojo {