A few more small changes to make GrAtlasTextBlob nearly self contained

src/gpu/text/GrAtlasTextContext.h

Index: src/gpu/text/GrAtlasTextContext.h
diff --git a/src/gpu/text/GrAtlasTextContext.h b/src/gpu/text/GrAtlasTextContext.h
index f3fe34579d8988c96588b0953dc79ea8ca0f7fab..94a9cffba192c10c92301e6c87c9246076c218d6 100644
--- a/src/gpu/text/GrAtlasTextContext.h
+++ b/src/gpu/text/GrAtlasTextContext.h
@@ -51,9 +51,6 @@ private:
                       const SkMatrix& viewMatrix, const SkTextBlob*, SkScalar x, SkScalar y,
                       SkDrawFilter*, const SkIRect& clipBounds) override;
 
-    typedef GrAtlasTextBlob::Run Run;
-    typedef Run::SubRunInfo PerSubRunInfo;
-
     // sets up the descriptor on the blob and returns a detached cache.  Client must attach
     inline static GrColor ComputeCanonicalColor(const SkPaint&, bool lcd);
     void regenerateTextBlob(GrAtlasTextBlob* bmp, const SkPaint& skPaint, GrColor,