force readbuffer clients to use specialized readFoo for flattenables

src/core/SkBlitter.cpp

Index: src/core/SkBlitter.cpp
diff --git a/src/core/SkBlitter.cpp b/src/core/SkBlitter.cpp
index 162fdbcd29e9a99e7b9f5f85b525c6df45069eb6..6ba82bf077b982e5aaae48ec4c747e3dda1ffdf3 100644
--- a/src/core/SkBlitter.cpp
+++ b/src/core/SkBlitter.cpp
@@ -683,7 +683,7 @@ public:
 
 protected:
     Sk3DShader(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {
-        fProxy = buffer.readFlattenableT<SkShader>();
+        fProxy = buffer.readShader();
         fPMColor = buffer.readColor();
         fMask = NULL;
     }