Preliminary attempt to remove batch tracker

src/gpu/GrBatchTarget.h

Index: src/gpu/GrBatchTarget.h
diff --git a/src/gpu/GrBatchTarget.h b/src/gpu/GrBatchTarget.h
index f317f3046e9c60786872d369863c4b4227439e5a..61f12d81698224443d55237f6a561503753897ba 100644
--- a/src/gpu/GrBatchTarget.h
+++ b/src/gpu/GrBatchTarget.h
@@ -104,12 +104,6 @@ public:
         fInlineUploads.reset();
     }
 
-    // TODO This goes away when everything uses batch
-    GrBatchTracker* currentBatchTracker() {
-        SkASSERT(!fFlushBuffer.empty());
-        return &fFlushBuffer.back().fBatchTracker;
-    }
-
     const GrDrawTargetCaps& caps() const { return *fGpu->caps(); }
 
     GrResourceProvider* resourceProvider() const { return fGpu->getContext()->resourceProvider(); }