Revert of Make GrTextContext be owned by the GrDrawContext

src/gpu/SkGpuDevice.h

Index: src/gpu/SkGpuDevice.h
diff --git a/src/gpu/SkGpuDevice.h b/src/gpu/SkGpuDevice.h
index cf85cd967398d2cb7fa25ef15944a9da1daf89c9..c06cdc2ed4a77ec5d7cd66b82f2065dcfd18a632 100644
--- a/src/gpu/SkGpuDevice.h
+++ b/src/gpu/SkGpuDevice.h
@@ -23,6 +23,7 @@
 
 class GrAccelData;
 struct GrCachedLayer;
+class GrTextContext;
 
 /**
  *  Subclass of SkBaseDevice, which directs all drawing to the GrGpu owned by the
@@ -150,6 +151,7 @@
     SkAutoTUnref<const SkClipStack> fClipStack;
     SkIPoint                        fClipOrigin;
     GrClip                          fClip;
+    GrTextContext*                  fTextContext;
     SkAutoTUnref<GrDrawContext>     fDrawContext;
     SkSurfaceProps                  fSurfaceProps;
     GrRenderTarget*                 fRenderTarget;
@@ -217,6 +219,7 @@
                                               int sampleCount);
 
     friend class GrAtlasTextContext;
+    friend class GrTextContext;
     typedef SkBaseDevice INHERITED;
 };