unsigned -> int for counts and indices in picture-related code

src/core/SkLayerInfo.h

Index: src/core/SkLayerInfo.h
diff --git a/src/core/SkLayerInfo.h b/src/core/SkLayerInfo.h
index 3d4b26960cfa8f9f725d11d36717a4bf28f93c2f..54c4f7b705ee2e8ec3c6d88c69a0e64b23a2e7b2 100644
--- a/src/core/SkLayerInfo.h
+++ b/src/core/SkLayerInfo.h
@@ -56,8 +56,8 @@ public:
         // The variable length key for this saveLayer block. It stores the
         // thread of drawPicture and saveLayer operation indices that lead to this
         // saveLayer (including its own op index). The BlockInfo owns this memory.
-        unsigned* fKey;
-        int     fKeySize;  // # of ints
+        int* fKey;
+        int  fKeySize;  // # of ints
     };
 
     SkLayerInfo() {}