Remove (almost) unused read/writeFunctionPtr API.

src/core/SkReadBuffer.h

Index: src/core/SkReadBuffer.h
diff --git a/src/core/SkReadBuffer.h b/src/core/SkReadBuffer.h
index ae03a690420aa7360dc6cb6c5a995f589c3d2b30..607f7d843faf5686859326458523321a33b8cde1 100644
--- a/src/core/SkReadBuffer.h
+++ b/src/core/SkReadBuffer.h
@@ -107,8 +107,6 @@ public:
     bool eof() { return fReader.eof(); }
     virtual const void* skip(size_t size) { return fReader.skip(size); }
 
-    void* readFunctionPtr() { return fReader.readPtr(); }
-
     // primitives
     virtual bool readBool();
     virtual SkColor readColor();
@@ -148,12 +146,6 @@ public:
     sk_sp<SkShader> readShader() { return this->readFlattenable<SkShader>(); }
     sk_sp<SkXfermode> readXfermode() { return this->readFlattenable<SkXfermode>(); }
 
-    /**
-     *  Like readFlattenable() but explicitly just skips the data that was written for the
-     *  flattenable (or the sentinel that there wasn't one).
-     */
-    virtual void skipFlattenable();
-
     // binary data and arrays
     virtual bool readByteArray(void* value, size_t size);
     virtual bool readColorArray(SkColor* colors, size_t size);