Revert of change all factories to return their base-class

gm/shadows.cpp

 /*
  * Copyright 2011 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 "SkBlurDrawLooper.h"
 #include "SkBlurMask.h"
@@ skipping 36 matching lines @@
 
     SkString onShortName() override {
         return SkString("shadows");
     }
 
     SkISize onISize() override {
         return SkISize::Make(200, 200);
     }
 
     void onDraw(SkCanvas* canvas) override {
-        SkDrawLooper* shadowLoopers[5];
+        SkBlurDrawLooper* shadowLoopers[5];
         shadowLoopers[0] =
             SkBlurDrawLooper::Create(SK_ColorBLUE,
                                      SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(10)),
                                      SkIntToScalar(5), SkIntToScalar(10),
                                      SkBlurDrawLooper::kIgnoreTransform_BlurFlag |
                                      SkBlurDrawLooper::kOverrideColor_BlurFlag |
                                      SkBlurDrawLooper::kHighQuality_BlurFlag);
         SkAutoUnref aurL0(shadowLoopers[0]);
         shadowLoopers[1] =
             SkBlurDrawLooper::Create(SK_ColorBLUE,
@@ skipping 75 matching lines @@
 private:
     typedef GM INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 static GM* MyFactory(void*) { return new ShadowsGM; }
 static GMRegistry reg(MyFactory);
 
 }