Revert of Hide SkCanvas::LayerIter

include/core/SkCanvas.h

Index: include/core/SkCanvas.h
diff --git a/include/core/SkCanvas.h b/include/core/SkCanvas.h
index ba5cd5ca737f286601cdb050bf4e8f4ddda7e35c..8e675b42fc49c738d808f27e101fdf9257e66375 100644
--- a/include/core/SkCanvas.h
+++ b/include/core/SkCanvas.h
@@ -1220,7 +1220,6 @@
 
     ///////////////////////////////////////////////////////////////////////////
 
-protected:
     /** After calling saveLayer(), there can be any number of devices that make
         up the top-most drawing area. LayerIter can be used to iterate through
         those devices. Note that the iterator is only valid until the next API
@@ -1259,7 +1258,6 @@
         bool              fDone;
     };
 
- public:
     // don't call
     GrRenderTarget* internal_private_accessTopLayerRenderTarget();
 
@@ -1433,7 +1431,6 @@
     void doSave();
     void checkForDeferredSave();
 
-    friend class CanvasTestingAccess; // for testing
     friend class SkDrawIter;        // needs setupDrawForLayerDevice()
     friend class AutoDrawLooper;
     friend class SkLua;             // needs top layer size and offset