Revert "Mark FixedBuffer copy ctor and assignment operator private"

This reverts commit 44f267dc5bfbdd7e73ec678abd3176535651b486.

Reason for revert: bug 116167149

Change-Id: Ia620be3257b7a45e8813c51d26d4e6f83310145b
diff --git a/shared/OpenglCodecCommon/FixedBuffer.h b/shared/OpenglCodecCommon/FixedBuffer.h
index 2789cb6..9a908de 100644
--- a/shared/OpenglCodecCommon/FixedBuffer.h
+++ b/shared/OpenglCodecCommon/FixedBuffer.h
@@ -48,11 +48,6 @@
     void *ptr() { return m_buffer; }
     size_t len() { return m_bufferLen; }
 private:
-    FixedBuffer(const FixedBuffer &rhs);
-    FixedBuffer &operator=(const FixedBuffer &rhs);
-    FixedBuffer(FixedBuffer &&rhs);
-    FixedBuffer &operator=(FixedBuffer &&rhs);
-
     unsigned char *m_buffer;
     size_t m_bufferLen;
 };