remove unused GM flags

gm/alphagradients.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 #include "SkCanvas.h"
 #include "SkGradientShader.h"
@@ skipping 54 matching lines @@
             canvas->save();
             for (size_t i = 0; i < SK_ARRAY_COUNT(gRec); ++i) {
                 draw_grad(canvas, r, gRec[i].fColor0, gRec[i].fColor1, SkToBool(doPreMul));
                 canvas->translate(0, r.height() + 8);
             }
             canvas->restore();
             canvas->translate(r.width() + 10, 0);
         }
     }
 
-    uint32_t onGetFlags() const SK_OVERRIDE { return kSkipPipe_Flag | kSkipTiled_Flag; }
-
 private:
     typedef skiagm::GM INHERITED;
 };
 
 DEF_GM( return SkNEW(AlphaGradientsGM); )