more SkInstCnt plumbing
fix some typeface leaks



git-svn-id: http://skia.googlecode.com/svn/trunk@4348 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/utils/SkDeferredCanvas.h b/include/utils/SkDeferredCanvas.h
index 87797ac..dd2c1f0 100644
--- a/include/utils/SkDeferredCanvas.h
+++ b/include/utils/SkDeferredCanvas.h
@@ -141,7 +141,12 @@
 public:
     class DeviceContext : public SkRefCnt {
     public:
+        SK_DECLARE_INST_COUNT(DeviceContext)
+
         virtual void prepareForDraw() {}
+        
+    private:
+        typedef SkRefCnt INHERITED;
     };
 
 public: