gdb::{unique_ptr,move} -> std::{unique_ptr,move}

Now that we require C++11, use std::unique_ptr and std::move directly.

gdb/ChangeLog:
2016-11-15  Pedro Alves  <palves@redhat.com>

	* ada-lang.c (create_excep_cond_exprs): Use std::move instead of
	gdb::move.
	* break-catch-throw.c (handle_gnu_v3_exceptions): Use
	std::unique_ptr instead of gdb::unique_ptr.
	* breakpoint.c (watch_command_1): Use std::move instead of
	gdb::move.
	* cli/cli-dump.c (dump_memory_to_file, restore_binary_file): Use
	std::unique_ptr instead of gdb::unique_ptr.
	* dtrace-probe.c (dtrace_process_dof_probe): Use std::move instead
	of gdb::move.
	* elfread.c (elf_read_minimal_symbols): Use std::unique_ptr
	instead of gdb::unique_ptr.
	* mi/mi-main.c (mi_cmd_data_read_memory): Use std::unique_ptr
	instead of gdb::unique_ptr.
	* parse.c (parse_expression_for_completion): Use std::move instead
	of gdb::move.
	* printcmd.c (display_command): std::move instead of gdb::move.

gdb/parse.c

@@ -1309,7 +1309,7 @@ parse_expression_for_completion (const char *string, char **name,
   TRY
     {
       parse_completion = 1;
-      exp = gdb::move (parse_exp_in_context (&string, 0, 0, 0, 0, &subexp));
+      exp = std::move (parse_exp_in_context (&string, 0, 0, 0, 0, &subexp));
     }
   CATCH (except, RETURN_MASK_ERROR)
     {