Tab audio icon doesn't show sometimes on non-active tabs

[bbondy]

Test plan:

• Indicator for audio must show if there's audio/video playing
• Mute indicator must show show if there's audio/video playing
• They should remain persistent while audio/video is playing

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• Did you search for similar issues before submitting this one?
  Yes

• Describe the issue you encountered:
  @cezaraugusto I'm still getting intermittently audio icon only showing on hover and when active. I don't have consistent steps but it definitely happens sometimes on facebook.com. It will not show an audio icon when a video is playing, and then when I hover over it to preview the tab then it comes up.

I suspect something in one of these props from tabContents.js
return this.pageCanPlayAudio && !this.mediumView && !this.narrowView

• Platform (Win7, 8, 10? macOS? Linux distro?):
  macOS, probably everywhere though.

• Brave Version (revision SHA):
  61ae1a7

• Steps to reproduce:
  Not consistent but...

  1. Login to facebook, play a video
  2. Open a bunch of other tabs
  3. when other tabs are focused, it can eventually get in a state where facebook's tab will only show the audio icon when previewed or hovered

• Actual result:
  Audio icon is sometimes hidden on non active tabs. There is no audio blue bar either.

• Expected result:
  Audio icon should always be visible (or the audio blue bar indicator if the tabs are small)

• Will the steps above reproduce in a fresh profile? If not what other info can be added?
  Yes, but you do have to play around with it for a few minutes before getting it. And it will sometimes start working again intermittently. I think it maybe gets 2 tabs confused in props or something. Like maybe the Facebook tab gets the audio status of the active tab instead of its own.

• Is this an issue in the currently released version?
  I don't think so.

• Can this issue be consistently reproduced?
  Not consistently but I've seen it several times since using the preview builds.

• Screenshot if needed:

• Any related issues:

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