Took out an method not used, that broke build

gfx/src/mac/nsImageMac.cpp

@@ -230,13 +230,6 @@ NS_IMETHODIMP nsImageMac :: Draw(nsIRenderingContext &aContext,
 
 //------------------------------------------------------------
 
-void nsImageMac::CompositeImage(nsIImage *aTheImage, nsPoint *aULLocation,nsBlendQuality aBlendQuality)
-{
-
-}
-
-//------------------------------------------------------------
-
 nsresult nsImageMac::Optimize(nsIDeviceContext* aContext)
 {
   return NS_OK;

gfx/src/mac/nsImageMac.h

@@ -51,7 +51,6 @@ public:
   virtual PRInt32     GetAlphaWidth()   { return mAlphaWidth;}
   virtual PRInt32     GetAlphaHeight()   {return mAlphaHeight;}
   virtual PRInt32     GetAlphaLineStride(){ return mARowBytes; }
-  virtual void        CompositeImage(nsIImage *aTheImage,nsPoint *aULLocation,nsBlendQuality aQuality);
   virtual nsIImage*   DuplicateImage() {return(nsnull);}
 
   void AllocConvertedBits(PRUint32 aSize);