Remove duplicate drawingsurface. fix memory leak

gfx/src/motif/nsDeviceContextUnix.cpp

@@ -140,12 +140,6 @@ nsIRenderingContext * nsDeviceContextUnix :: CreateRenderingContext(nsIView *aVi
   nsIWidget *win = aView->GetWidget();
   nsresult            rv;
 
-  mSurface = new nsDrawingSurfaceUnix();
-
-  mSurface->display =  (Display *)win->GetNativeData(NS_NATIVE_DISPLAY);
-  mSurface->drawable = (Drawable)win->GetNativeData(NS_NATIVE_WINDOW);
-  mSurface->gc       = (GC)win->GetNativeData(NS_NATIVE_GRAPHIC);
-
   static NS_DEFINE_IID(kRCCID, NS_RENDERING_CONTEXT_CID);
   static NS_DEFINE_IID(kRCIID, NS_IRENDERING_CONTEXT_IID);
 

gfx/src/motif/nsRenderingContextUnix.cpp

@@ -119,6 +119,7 @@ nsRenderingContextUnix :: ~nsRenderingContextUnix()
     mStateCache = nsnull;
   }
 
+  delete mRenderingSurface;
 }
 
 NS_IMPL_QUERY_INTERFACE(nsRenderingContextUnix, kRenderingContextIID)
@@ -138,6 +139,7 @@ nsresult nsRenderingContextUnix :: Init(nsIDeviceContext* aContext,
   mRenderingSurface->drawable = (Drawable)aWindow->GetNativeData(NS_NATIVE_WINDOW);
   mRenderingSurface->gc       = (GC)aWindow->GetNativeData(NS_NATIVE_GRAPHIC);
 
+
   ((nsDeviceContextUnix *)aContext)->SetDrawingSurface(mRenderingSurface);
   ((nsDeviceContextUnix *)aContext)->InstallColormap();