You only delete all room or a specific history: https://confluence.atlassian.com/display/HIPCHAT/Delete+messages+and+files
But I found a chrome plugin to clear all history https://chrome.google.com/webstore/detail/hipchat-history-cleaner/cljfdgmalikglkefpoacplgeefpaebgk?hl=en. I think you are looking for something like that.
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