Remove SharedBuffer::unlock() and keep Resource's SharedBuffer always locked

third_party/WebKit/Source/platform/SharedBuffer.h

 /*
  * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 127 matching lines @@
     bool getPartAsBytes(void* dest, STRICTLY_TYPED_ARG(position), STRICTLY_TYPED_ARG(byteLength)) const
     {
         STRICT_ARG_TYPE(size_t);
         return getAsBytesInternal(dest, position, byteLength);
     }
 
     // Creates an SkData and copies this SharedBuffer's contents to that
     // SkData without merging segmented buffers into a flat buffer.
     sk_sp<SkData> getAsSkData() const;
 
-    // See PurgeableVector::lock().
-    bool lock();
-
-    // WARNING: Calling unlock() on a SharedBuffer that wasn't created with the
-    // purgeability option does an extra memcpy(). Please use
-    // SharedBuffer::createPurgeable() if you intend to call unlock().
-    void unlock();
-
-    bool isLocked() const;
-
     void onMemoryDump(const String& dumpPrefix, WebProcessMemoryDump*) const;
 
 private:
     SharedBuffer();
     explicit SharedBuffer(size_t);
     SharedBuffer(const char*, size_t);
     SharedBuffer(const unsigned char*, size_t);
     SharedBuffer(const char*, size_t, PurgeableVector::PurgeableOption);
 
     // See SharedBuffer::data().
     void mergeSegmentsIntoBuffer() const;
 
     void appendInternal(const char* data, size_t);
     bool getAsBytesInternal(void* dest, size_t, size_t) const;
     size_t getSomeDataInternal(const char*& data, size_t position) const;
 
     size_t m_size;
     mutable PurgeableVector m_buffer;
     mutable Vector<char*> m_segments;
 };
 
 } // namespace blink
 
 #endif // SharedBuffer_h