Remove SK_SUPPORT_LEGACY_DEEPFLATTENING.

src/effects/SkAlphaThresholdFilter.cpp

Index: src/effects/SkAlphaThresholdFilter.cpp
diff --git a/src/effects/SkAlphaThresholdFilter.cpp b/src/effects/SkAlphaThresholdFilter.cpp
index e1816754092ac52378dc827de1f31b6f6a77456a..ffdba322649a30ebd4cec24f37e57364ca038f4c 100644
--- a/src/effects/SkAlphaThresholdFilter.cpp
+++ b/src/effects/SkAlphaThresholdFilter.cpp
@@ -19,9 +19,6 @@ public:
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkAlphaThresholdFilterImpl)
 
 protected:
-#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
-    explicit SkAlphaThresholdFilterImpl(SkReadBuffer& buffer);
-#endif
     virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
 
     virtual bool onFilterImage(Proxy*, const SkBitmap& src, const Context&,
@@ -238,15 +235,6 @@ void AlphaThresholdEffect::onComputeInvariantOutput(GrInvariantOutput* inout) co
 
 #endif
 
-#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
-SkAlphaThresholdFilterImpl::SkAlphaThresholdFilterImpl(SkReadBuffer& buffer)
-  : INHERITED(1, buffer) {
-    fInnerThreshold = buffer.readScalar();
-    fOuterThreshold = buffer.readScalar();
-    buffer.readRegion(&fRegion);
-}
-#endif
-
 SkFlattenable* SkAlphaThresholdFilterImpl::CreateProc(SkReadBuffer& buffer) {
     SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
     SkScalar inner = buffer.readScalar();