Remove SK_SUPPORT_LEGACY_DEEPFLATTENING.

src/core/SkFilterShader.cpp

Index: src/core/SkFilterShader.cpp
diff --git a/src/core/SkFilterShader.cpp b/src/core/SkFilterShader.cpp
index cb042e604cd71836f999f881dc8632dfa262fbd1..48c4b8b477314ba2fbf9a6e64a5859754c7023d7 100644
--- a/src/core/SkFilterShader.cpp
+++ b/src/core/SkFilterShader.cpp
@@ -21,13 +21,6 @@ SkFilterShader::SkFilterShader(SkShader* shader, SkColorFilter* filter) {
     filter->ref();
 }
 
-#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
-SkFilterShader::SkFilterShader(SkReadBuffer& buffer) : INHERITED(buffer) {
-    fShader = buffer.readShader();
-    fFilter = buffer.readColorFilter();
-}
-#endif
-
 SkFilterShader::~SkFilterShader() {
     fFilter->unref();
     fShader->unref();