Remove position from FrontBufferedStream

src/utils/SkFrontBufferedStream.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkFrontBufferedStream.h"
 #include "SkStream.h"
 #include "SkTemplates.h"
 
 class FrontBufferedStream : public SkStreamRewindable {
 public:
     // Called by Create.
     FrontBufferedStream(SkStream*, size_t bufferSize);
 
     size_t read(void* buffer, size_t size) override;
 
     size_t peek(void* buffer, size_t size) const override;
 
     bool isAtEnd() const override;
 
     bool rewind() override;
 
-    bool hasPosition() const override { return true; }
-
-    size_t getPosition() const override { return fOffset; }
-
     bool hasLength() const override { return fHasLength; }
 
     size_t getLength() const override { return fLength; }
 
     SkStreamRewindable* duplicate() const override { return nullptr; }
 
 private:
     SkAutoTDelete<SkStream> fStream;
     const bool              fHasLength;
     const size_t            fLength;
@@ skipping 168 matching lines @@
     }
 
     if (size > 0 && !fStream->isAtEnd()) {
         SkDEBUGCODE(const size_t bytesReadDirectly =) this->readDirectlyFromStream(dst, size);
         SkDEBUGCODE(size -= bytesReadDirectly;)
         SkASSERT(size + (fOffset - start) == totalSize);
     }
 
     return fOffset - start;
 }