fix up virtual / override stuff

BUG=skia:

Review URL: https://codereview.chromium.org/1210283002
diff --git a/src/core/SkPictureRecord.h b/src/core/SkPictureRecord.h
index e2d5f7d..ed5d065 100644
--- a/src/core/SkPictureRecord.h
+++ b/src/core/SkPictureRecord.h
@@ -159,18 +159,16 @@
 
     void onDrawDRRect(const SkRRect&, const SkRRect&, const SkPaint&) override;
 
-    virtual void onDrawText(const void* text, size_t byteLength, SkScalar x, SkScalar y,
-                            const SkPaint&) override;
-    virtual void onDrawPosText(const void* text, size_t byteLength, const SkPoint pos[],
-                               const SkPaint&) override;
-    virtual void onDrawPosTextH(const void* text, size_t byteLength, const SkScalar xpos[],
-                                SkScalar constY, const SkPaint&) override;
-    virtual void onDrawTextOnPath(const void* text, size_t byteLength, const SkPath& path,
+    void onDrawText(const void* text, size_t, SkScalar x, SkScalar y, const SkPaint&) override;
+    void onDrawPosText(const void* text, size_t, const SkPoint pos[], const SkPaint&) override;
+    void onDrawPosTextH(const void* text, size_t, const SkScalar xpos[], SkScalar constY,
+                        const SkPaint&) override;
+    void onDrawTextOnPath(const void* text, size_t byteLength, const SkPath& path,
                                   const SkMatrix* matrix, const SkPaint&) override;
-    virtual void onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y,
+    void onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y,
                                 const SkPaint& paint) override;
 
-    virtual void onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
+    void onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
                              const SkPoint texCoords[4], SkXfermode* xmode,
                              const SkPaint& paint) override;
     void onDrawAtlas(const SkImage*, const SkRSXform[], const SkRect[], const SkColor[], int,