style nit cleanups. e.g. remove 'virtual' on override declarations

src/effects/gradients/SkSweepGradient.h

Index: src/effects/gradients/SkSweepGradient.h
diff --git a/src/effects/gradients/SkSweepGradient.h b/src/effects/gradients/SkSweepGradient.h
index 7e08d97b61b75edffd7cf54163f28574000ffc16..1edc9682de65f64b3cdd3d4538a21b313f5ee642 100644
--- a/src/effects/gradients/SkSweepGradient.h
+++ b/src/effects/gradients/SkSweepGradient.h
@@ -28,15 +28,13 @@ public:
         typedef SkGradientShaderBase::GradientShaderBaseContext INHERITED;
     };
 
-    virtual BitmapType asABitmap(SkBitmap* bitmap,
-                                 SkMatrix* matrix,
-                                 TileMode* xy) const override;
+    BitmapType asABitmap(SkBitmap* bitmap, SkMatrix* matrix, TileMode* xy) const override;
 
     GradientType asAGradient(GradientInfo* info) const override;
 
-    virtual bool asFragmentProcessor(GrContext*, const SkPaint&, const SkMatrix& viewM,
-                                     const SkMatrix*, GrColor*,
-                                     GrFragmentProcessor**) const override;
+    bool asFragmentProcessor(GrContext*, const SkPaint&, const SkMatrix& viewM,
+                             const SkMatrix*, GrColor*,
+                             GrFragmentProcessor**) const override;
 
     SK_TO_STRING_OVERRIDE()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkSweepGradient)