Small cleanup.

Removes unnecessary forward class declaration, make Caches::currentBuffer
private instead of public.

Change-Id: Idba6325c8c602d89239e667cb8ec87e7943f8e75
diff --git a/libs/hwui/Caches.h b/libs/hwui/Caches.h
index 79644a5..aff5366 100644
--- a/libs/hwui/Caches.h
+++ b/libs/hwui/Caches.h
@@ -79,7 +79,9 @@
 
     friend class Singleton<Caches>;
 
-    CacheLogger logger;
+    CacheLogger mlogger;
+
+    GLuint mCurrentBuffer;
 
 public:
     void bindMeshBuffer();
@@ -92,7 +94,6 @@
     Program* currentProgram;
 
     GLuint meshBuffer;
-    GLuint currentBuffer;
 
     TextureCache textureCache;
     LayerCache layerCache;