Add reallyHasAlpha() to SkAndroidCodec

src/codec/SkWebpCodec.h

Index: src/codec/SkWebpCodec.h
diff --git a/src/codec/SkWebpCodec.h b/src/codec/SkWebpCodec.h
index 5c0f0286f7cc14c49aab38f883834c110ea1ed47..dfc9f12ee98fbcec946f4c879fb71acafe573948 100644
--- a/src/codec/SkWebpCodec.h
+++ b/src/codec/SkWebpCodec.h
@@ -27,10 +27,6 @@ protected:
             override;
     SkEncodedFormat onGetEncodedFormat() const override { return kWEBP_SkEncodedFormat; }
 
-    bool onReallyHasAlpha() const override {
-        return this->getInfo().alphaType() != kOpaque_SkAlphaType;
-    }
-
     SkISize onGetScaledDimensions(float desiredScale) const override;
 
     bool onDimensionsSupported(const SkISize&) override;