Add sharing to social media sites (Facebook, twitter, etc.)

[alexwykoff]

Test Plan

1. Open a site in new tab
2. Click File -> Share ->
3. Share submenu should contain Email, Tweet Page, Share on Facebook, Pinterest, Google+, Linkedin, Buffer and Reddit

Original Issue

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

• Describe the issue you encountered:

• Platform (Win7, 8, 10? macOS? Linux distro?):

• Brave Version (revision SHA):

• Steps to reproduce:
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• Actual result:

• Expected result:

• Will the steps above reproduce in a fresh profile? If not what other info can be added?

• Is this an issue in the currently released version?

• Can this issue be consistently reproduced?

• Extra QA steps:
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• Screenshot if needed:

• Any related issues:

[cndouglas]

Related: #1988

[bsclifton]

Closing as a dupe of #1988

If I read this wrong, please re-open and add more information 😄 Thanks!

[cndouglas]

Actually, I think the sharing feature in this issue is cross-platform, like Firefox:

The share menu item in #1988 is macOS-only (see the screenshot I just posted there).