remove a dependency of DisplayDevice on the refresh rate

this remove a dependency (not all) on FramebufferSurface

Change-Id: Ie07ce70760cdcedfb41b5b41bea8da45637bf474
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index 6f224b6..feeccf6 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -336,7 +336,7 @@
 
     HWComposer& getHwComposer() const { return *mHwc; }
 
-        /* ------------------------------------------------------------------------
+    /* ------------------------------------------------------------------------
      * Compositing
      */
     void invalidateHwcGeometry();