Remove stray #pragma implementation.

This #pragma is obsolete and shouldn't be used any more (if it ever had to
be).

See #12927.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66972 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/html/htmlctrl/webkit/webkit.mm

@@ -9,10 +9,6 @@
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
-    #pragma implementation "webkit.h"
-#endif
-
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 #include "wx/splitter.h"