Bug 1297306 - part2:make the implementation of nsLineBox::LastChild() be behind DEBUG_FRAME_DUMP flag. r=xidorn

This should've been covered in Bug 956447. The declaration is already behind
DEBUG_FRAME_DUMP in nsLineBox.h. Just move the implementation to agreee with that.

MozReview-Commit-ID: 9N0WxKkajF1

--HG--
extra : rebase_source : b79b068b8a84c66f289d40deb5b5b9347fb7c4a4

layout/generic/nsLineBox.cpp

@@ -282,9 +282,7 @@ nsLineBox::List(FILE* out, const char* aPrefix, uint32_t aFlags) const
   }
   fprintf_stderr(out, "%s>\n", aPrefix);
 }
-#endif
 
-#ifdef DEBUG
 nsIFrame*
 nsLineBox::LastChild() const
 {