Revert of enforce 16byte alignment in shader contexts

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 f458cea8ce773a47eb2c8a4ff721f5bb7ddd0740..ec6df45c645c5afb9510d0af63c353fb2539bf06 100644
--- a/src/effects/gradients/SkSweepGradient.h
+++ b/src/effects/gradients/SkSweepGradient.h
@@ -14,6 +14,8 @@
 class SkSweepGradient : public SkGradientShaderBase {
 public:
     SkSweepGradient(SkScalar cx, SkScalar cy, const Descriptor&);
+
+    size_t contextSize(const ContextRec&) const override;
 
     class SweepGradientContext : public SkGradientShaderBase::GradientShaderBaseContext {
     public:
@@ -39,7 +41,6 @@
 
 protected:
     void flatten(SkWriteBuffer& buffer) const override;
-    size_t onContextSize(const ContextRec&) const override;
     Context* onCreateContext(const ContextRec&, void* storage) const override;
 
 private: