Remove SK_SUPPORT_LEGACY_DEEPFLATTENING.

src/effects/SkColorFilters.cpp

Index: src/effects/SkColorFilters.cpp
diff --git a/src/effects/SkColorFilters.cpp b/src/effects/SkColorFilters.cpp
index e085281aa5e3901741f6d4c7287da6136749a029..92e6f432f17c24cf5c2d2b020ccc769b88ddeb8d 100644
--- a/src/effects/SkColorFilters.cpp
+++ b/src/effects/SkColorFilters.cpp
@@ -84,17 +84,6 @@ protected:
         buffer.writeUInt(fMode);
     }
 
-#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
-    SkModeColorFilter(SkReadBuffer& buffer) {
-        fColor = buffer.readColor();
-        fMode = (SkXfermode::Mode)buffer.readUInt();
-        if (buffer.isValid()) {
-            this->updateCache();
-            buffer.validate(SkIsValidMode(fMode));
-        }
-    }
-#endif
-
 private:
     SkColor             fColor;
     SkXfermode::Mode    fMode;