Generate a templated Clone method for all mojo structs.

mojo/public/cpp/bindings/tests/pickled_struct_blink.h

Index: mojo/public/cpp/bindings/tests/pickled_struct_blink.h
diff --git a/mojo/public/cpp/bindings/tests/pickled_struct_blink.h b/mojo/public/cpp/bindings/tests/pickled_struct_blink.h
index c763c6e94e7c511f723637ce4deb693811babc65..fc743b82b3b05aad318e474eb2a77edb87b55e99 100644
--- a/mojo/public/cpp/bindings/tests/pickled_struct_blink.h
+++ b/mojo/public/cpp/bindings/tests/pickled_struct_blink.h
@@ -32,7 +32,7 @@ class PickledStructBlink {
  public:
   PickledStructBlink();
   PickledStructBlink(int foo, int bar);
-  PickledStructBlink(PickledStructBlink&& other) = default;
+  PickledStructBlink(PickledStructBlink&& other);
   ~PickledStructBlink();
 
   PickledStructBlink& operator=(PickledStructBlink&& other) = default;