Switch SkPDFStream's internal storage from SkStream to SkData

src/images/SkStreamHelpers.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 SkStreamHelpers_DEFINED
-#define SkStreamHelpers_DEFINED
-
-class SkAutoMalloc;
-class SkStream;
-class SkData;
-
-/**
- *  Copy the provided stream to memory allocated by storage.
- *  Used by SkImageDecoder_libbmp and SkImageDecoder_libico.
- *  @param storage Allocator to hold the memory. Will be reset to be large
- *      enough to hold the entire stream. Upon successful return,
- *      storage->get() will point to data holding the SkStream's entire
- *      contents.
- *  @param stream SkStream to be copied into storage.
- *  @return size_t Total number of bytes in the SkStream, which is also the
- *      number of bytes pointed to by storage->get(). Returns 0 on failure.
- */
-size_t CopyStreamToStorage(SkAutoMalloc* storage, SkStream* stream);
-
-/**
- *  Copy the provided stream to an SkData variable. Used by SkImageDecoder_libktx.
- *  @param stream SkStream to be copied into data.
- *  @return SkData* The resulting SkData after the copy. This data will have a
- *      ref count of one upon return and belongs to the caller. Returns NULL on failure.
- */
-SkData *CopyStreamToData(SkStream* stream);
-
-#endif // SkStreamHelpers_DEFINED