core: remove unused method from CompositeReadableBuffer

Author: panchenko

core/src/main/java/io/grpc/internal/CompositeReadableBuffer.java

@@ -23,7 +23,6 @@
 import java.nio.InvalidMarkException;
 import java.util.ArrayDeque;
 import java.util.Deque;
-import java.util.Queue;
 import javax.annotation.Nullable;
 
 /**
@@ -39,7 +38,6 @@ public class CompositeReadableBuffer extends AbstractReadableBuffer {
   private final Deque<ReadableBuffer> readableBuffers;
   private Deque<ReadableBuffer> rewindableBuffers;
   private int readableBytes;
-  private final Queue<ReadableBuffer> buffers = new ArrayDeque<ReadableBuffer>(2);
   private boolean marked;
 
   public CompositeReadableBuffer(int initialCapacity) {
@@ -161,31 +159,6 @@ public void readBytes(OutputStream dest, int length) throws IOException {
     execute(STREAM_OP, length, dest, 0);
   }
 
-  /**
-   * Reads {@code length} bytes from this buffer and writes them to the destination buffer.
-   * Increments the read position by {@code length}. If the required bytes are not readable, throws
-   * {@link IndexOutOfBoundsException}.
-   *
-   * @param dest the destination buffer to receive the bytes.
-   * @param length the number of bytes to be copied.
-   * @throws IndexOutOfBoundsException if required bytes are not readable
-   */
-  public void readBytes(CompositeReadableBuffer dest, int length) {
-    checkReadable(length);
-    readableBytes -= length;
-
-    while (length > 0) {
-      ReadableBuffer buffer = buffers.peek();
-      if (buffer.readableBytes() > length) {
-        dest.addBuffer(buffer.readBytes(length));
-        length = 0;
-      } else {
-        dest.addBuffer(buffers.poll());
-        length -= buffer.readableBytes();
-      }
-    }
-  }
-
   @Override
   public ReadableBuffer readBytes(int length) {
     if (length <= 0) {