change readTypeface to return sk_sp

src/core/SkValidatingReadBuffer.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkValidatingReadBuffer_DEFINED
 #define SkValidatingReadBuffer_DEFINED
 
@@ skipping 44 matching lines @@
     // binary data and arrays
     bool readByteArray(void* value, size_t size) override;
     bool readColorArray(SkColor* colors, size_t size) override;
     bool readIntArray(int32_t* values, size_t size) override;
     bool readPointArray(SkPoint* points, size_t size) override;
     bool readScalarArray(SkScalar* values, size_t size) override;
 
     // helpers to get info about arrays and binary data
     uint32_t getArrayCount() override;
 
-    // TODO: Implement this (securely) when needed
-    SkTypeface* readTypeface() override;
-
     bool validate(bool isValid) override;
     bool isValid() const override;
 
     bool validateAvailable(size_t size) override;
 
 private:
     bool readArray(void* value, size_t size, size_t elementSize);
 
     void setMemory(const void* data, size_t size);
 
     static bool IsPtrAlign4(const void* ptr) {
         return SkIsAlign4((uintptr_t)ptr);
     }
 
     bool fError;
 
     typedef SkReadBuffer INHERITED;
 };
 
 #endif // SkValidatingReadBuffer_DEFINED