Issue #21 - Remove use counters telemetry

This reverts Bug 968923 - Implement some equivalent of Chrome's use counters (on top of telemetry?)

For reference: https://bugzilla.mozilla.org/show_bug.cgi?id=968923

image/VectorImage.cpp

@@ -34,7 +34,6 @@
 #include "SVGDocumentWrapper.h"
 #include "nsIDOMEventListener.h"
 #include "SurfaceCache.h"
-#include "nsDocument.h"
 
 // undef the GetCurrentTime macro defined in WinBase.h from the MS Platform SDK
 #undef GetCurrentTime
@@ -1328,15 +1327,6 @@ VectorImage::InvalidateObserversOnNextRefreshDriverTick()
   }
 }
 
-void
-VectorImage::PropagateUseCounters(nsIDocument* aParentDocument)
-{
-  nsIDocument* doc = mSVGDocumentWrapper->GetDocument();
-  if (doc) {
-    doc->PropagateUseCounters(aParentDocument);
-  }
-}
-
 nsIntSize
 VectorImage::OptimalImageSizeForDest(const gfxSize& aDest,
                                      uint32_t aWhichFrame,