UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.101 Safari/537.36

Steps to reproduce the problem:
1. Use the following code inside of a chrome extension background page:
chrome.webRequest.onBeforeSendHeaders.addListener(
  function(details) {
    if (details.tabId !== -1) {
      console.log("I'm here")
    }
    return { requestHeaders: details.requestHeaders };
  },
  {
    urls: ['https://google.com/*'],
    tabId: -1
  },
  ['blocking', 'requestHeaders']
);

2. Inside any other normal tab:
fetch("https://google.com/")

What is the expected behavior?
background page has nothing logged because the listener should filter out any tabId != -1

What went wrong?
the background page logs "I'm here" because the "tabId: -1" filter does nothing

Did this work before? N/A 

Does this work in other browsers? Yes

Chrome version: 60.0.3112.101  Channel: stable
OS Version: OS X 10.12.6
Flash Version: