Fix Clang-tidy misc-use-override warnings in source/Commands headers, unify closing inclusion guards

patch by Eugene Zelenko.

Differential Revision: http://reviews.llvm.org/D12207

llvm-svn: 246628
diff --git a/lldb/source/Commands/CommandObjectProcess.h b/lldb/source/Commands/CommandObjectProcess.h
index 0aaa74d..804c342 100644
--- a/lldb/source/Commands/CommandObjectProcess.h
+++ b/lldb/source/Commands/CommandObjectProcess.h
@@ -27,11 +27,9 @@
 public:
     CommandObjectMultiwordProcess (CommandInterpreter &interpreter);
 
-    virtual
-    ~CommandObjectMultiwordProcess ();
-
+    ~CommandObjectMultiwordProcess() override;
 };
 
 } // namespace lldb_private
 
-#endif  // liblldb_CommandObjectProcess_h_
+#endif // liblldb_CommandObjectProcess_h_