Add wxOVERRIDE to test files

And cleanup some tailing spaces and tabs.

tests/html/htmlwindow.cpp

@@ -35,8 +35,8 @@ class HtmlWindowTestCase : public CppUnit::TestCase
 public:
     HtmlWindowTestCase() { }
 
-    virtual void setUp();
-    virtual void tearDown();
+    virtual void setUp() wxOVERRIDE;
+    virtual void tearDown() wxOVERRIDE;
 
 private:
     CPPUNIT_TEST_SUITE( HtmlWindowTestCase );