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/CommandObjectPlugin.h b/lldb/source/Commands/CommandObjectPlugin.h
index 9d0f0fc..0a96041 100644
--- a/lldb/source/Commands/CommandObjectPlugin.h
+++ b/lldb/source/Commands/CommandObjectPlugin.h
@@ -13,7 +13,6 @@
 // C Includes
 // C++ Includes
 
-
 // Other libraries and framework includes
 // Project includes
 
@@ -27,10 +26,9 @@
     public:
         CommandObjectPlugin (CommandInterpreter &interpreter);
         
-        virtual
-        ~CommandObjectPlugin ();
+        ~CommandObjectPlugin() override;
     };
     
 } // namespace lldb_private
 
-#endif  // liblldb_CommandObjectPlugin_h_
+#endif // liblldb_CommandObjectPlugin_h_