Revert of Move instanced index buffer creation to flush time

include/gpu/GrTextureProvider.h

Index: include/gpu/GrTextureProvider.h
diff --git a/include/gpu/GrTextureProvider.h b/include/gpu/GrTextureProvider.h
index 3f8c760f9b8c3b29343b8dba324143d1d04942da..3e29dabd47526404647ed0de339f0569567e2259 100644
--- a/include/gpu/GrTextureProvider.h
+++ b/include/gpu/GrTextureProvider.h
@@ -154,12 +154,6 @@
         fGpu = NULL;
     }
 
-    GrResourceCache* cache() { return fCache; }
-    const GrResourceCache* cache() const { return fCache; }
-
-    GrGpu* gpu() { return fGpu; }
-    const GrGpu* gpu() const { return fGpu; }
-
 private:
     bool isAbandoned() const {
         SkASSERT(SkToBool(fGpu) == SkToBool(fCache));