HBASE-22789 Removed deprecated method from ImmutableBytesWritable

Signed-off-by: stack <stack@apache.org>

hbase-common/src/main/java/org/apache/hadoop/hbase/io/ImmutableBytesWritable.java

@@ -115,21 +115,6 @@ public void set(final byte [] b, final int offset, final int length) {
     this.length = length;
   }
 
-  /**
-   * @return the number of valid bytes in the buffer
-   * @deprecated since 0.98.5. Use {@link #getLength()} instead
-   * @see #getLength()
-   * @see <a href="https://issues.apache.org/jira/browse/HBASE-11561">HBASE-11561</a>
-   */
-  @Deprecated
-  public int getSize() {
-    if (this.bytes == null) {
-      throw new IllegalStateException("Uninitialiized. Null constructor " +
-        "called w/o accompaying readFields invocation");
-    }
-    return this.length;
-  }
-
   /**
    * @return the number of valid bytes in the buffer
    */