Revert of enforce 16byte alignment in shader contexts

src/effects/gradients/SkRadialGradient.h

Index: src/effects/gradients/SkRadialGradient.h
diff --git a/src/effects/gradients/SkRadialGradient.h b/src/effects/gradients/SkRadialGradient.h
index 428d7fae79e1e8d88247ba53e04a28f12c7f3607..9d98f183040eac35ba6d73e2426a35908c9697ea 100644
--- a/src/effects/gradients/SkRadialGradient.h
+++ b/src/effects/gradients/SkRadialGradient.h
@@ -14,6 +14,8 @@
 class SkRadialGradient : public SkGradientShaderBase {
 public:
     SkRadialGradient(const SkPoint& center, SkScalar radius, const Descriptor&);
+
+    size_t contextSize(const ContextRec&) const override;
 
     class RadialGradientContext : public SkGradientShaderBase::GradientShaderBaseContext {
     public:
@@ -39,7 +41,6 @@
 protected:
     SkRadialGradient(SkReadBuffer& buffer);
     void flatten(SkWriteBuffer& buffer) const override;
-    size_t onContextSize(const ContextRec&) const override;
     Context* onCreateContext(const ContextRec&, void* storage) const override;
 
 private: