Fingerprinting 2.0: Plugins (mimetype)

[pes10k]

Continuing from #9435

The new fake plugins we're adding are causing naive JS code to crash because it assumes that every plugin has at least 1 associated MIME type, so code like navigator.plugins[0][0].type crashes. So the fake plugins we create and inject into navigator.plugins should also include at least 1 associated MIME type.

STR as per @pilgrim-brave:

As per #10716, run through the following STR/Cases:

1. Go to espn.com
2. Scroll to any of the videos.
3. Hit play button on any of the videos (the short ones not the ones that to go to premium service) and notice the video doesn't play.

[GeetaSarvadnya]

Verification passed on

Brave | 1.12.105 Chromium: 84.0.4147.105 (Official Build) (64-bit)
-- | --
Revision | a6b12dfad6663f13a7e16e9a42a6a4975374096b-refs/branch-heads/4147@{#943}
OS | Windows 10 OS Version 1903 (Build 18362.959)

• Verified the test plan from Implement associated MIME info for fake plugins brave-core#6067
• Ensured that videos play without any issues in default shield settings

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Verification passed on

Brave	1.12.105 Chromium: 84.0.4147.105 (Official Build) (64-bit)
Revision	a6b12dfad6663f13a7e16e9a42a6a4975374096b-refs/branch-heads/4147@{#943}
OS	Ubuntu 18.04 LTS

• Verified the test plan from Implement associated MIME info for fake plugins brave-core#6067
• Ensured that videos play without any issues in default shield settings

---

Verified passed with

Brave | 1.12.105 Chromium: 84.0.4147.105 (Official Build) (64-bit)
-- | --
Revision | a6b12dfad6663f13a7e16e9a42a6a4975374096b-refs/branch-heads/4147@{#943}
OS | macOS Version 10.14.6 (Build 18G3020)

• Verified STR from description and test plan from Implement associated MIME info for fake plugins brave-core#6067
• Confirmed able to play the short videos on espn.com (not the ones that lead to premium service) with default shield settings
• Confirmed able to play/pause/fast forward/rewind the short videos