Fixed misspell of virtual.

gfx/src/mac/nsImageMac.h

@@ -38,7 +38,7 @@ public:
   virtual PRInt32     GetWidth()          { return mWidth; }
   virtual PRUint8*    GetBits() ;          //{ return mImageBits; }
   virtual void*       GetBitInfo()        { return nsnull; }
-  virutal PRBool      GetIsRowOrderTopToBottom() { return mIsTopToBottom; }
+  virtual PRBool      GetIsRowOrderTopToBottom() { return mIsTopToBottom; }
   virtual PRInt32     GetLineStride()     {return mRowBytes; }
   NS_IMETHOD Draw(nsIRenderingContext &aContext, nsDrawingSurface aSurface, PRInt32 aX, PRInt32 aY, PRInt32 aWidth, PRInt32 aHeight);
   NS_IMETHOD Draw(nsIRenderingContext &aContext, nsDrawingSurface aSurface, PRInt32 aSX, PRInt32 aSY, PRInt32 aSWidth, PRInt32 aSHeight,