UserAgent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.98 Safari/537.36

Steps to reproduce the problem:
1. Visit https://en.wikipedia.org to make sure the site is cached and in history
2. Install extension
   manifest.json:
    {
      "name": "Tab ID",
      "version": "0.1",
      "description": "Inconsistent tab id",
      "permissions": ["tabs"],
      "background": {
        "scripts": ["background.js"]
      },
      "browser_action": {
      },

      "manifest_version": 2
    }

   background.js:
    chrome.tabs.onActivated.addListener(
      function(activeInfo) {
        chrome.extension.getBackgroundPage().console.log("Activated tab "+activeInfo.tabId);
      }
    );

    chrome.tabs.onCreated.addListener(
      function(tab) {
        chrome.extension.getBackgroundPage().console.log("Created tab " + tab.id);
      }
    );

    chrome.tabs.onUpdated.addListener(
      function(tabId, changeInfo, tab) {
        chrome.extension.getBackgroundPage().console.log("Updated tab " +tab.id);
      }
    );

    chrome.tabs.onRemoved.addListener(
      function(tabId, removeInfo) {
        chrome.extension.getBackgroundPage().console.log("Closed " + tabId);
      }
    );
3. Create a new tab and watch the tab id output by the extension
4. Go to https://en.wikipedia.org by selecting the URL using autocomplete
5. Close tab

What is the expected behavior?
In step 4: call of onUpdate with same tab id as in step 3
In step 5: call of onRemoved with same tab id as in step 3

What went wrong?
In step 4: call of onActivated with a new tab id ("tab id as in step 3" + 2)
In step 5: call of onRemoved with the new tab id new tab id ("tab id as in step 3" + 2)

Did this work before? N/A 

Chrome version: 57.0.2987.98  Channel: n/a
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: 

Yes! Accessing the tab id is extremely inconsistent. Four similar callbacks as shown in the sample extension, and three different ways to get the tab id: tab.id, tabId, activeInfo.tabId.