Set the file type filter when presenting a save dialog

[jonathansampson]

Test plan

#11906 (comment)

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

• Describe the issue you encountered:
  When saving an image, Brave does not populate the Save as type value in the dialog.

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

• Brave Version (revision SHA):
  3de60d5

• Steps to reproduce:

  1. Navigate to https://i.imgur.com/3w0l0MM.png
  2. Right click, and select Save Image
  3. Note that Save as type is "All Files (*.*)" rather than "PNG Image"

• Actual result:

• Expected result:

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

• Is this an issue in the currently released version?
  Yes

• Can this issue be consistently reproduced?
  Yes

[luixxiul]

duping to #1985 and #2554 ?

[bsclifton]

@luixxiul this is a little different (but related). The "Save as type" box should be set based on the file name. This change will be a Muon/electron change

[bsclifton]

@jonathansampson should this be in 0.14.2? We're closing up dev on this soon and without an owner, it's at risk

[jonathansampson]

@bsclifton It should not. I've punted to 1.0.0. In fact, we may in fact close in favor of #1985.

[bsclifton]

Moving to 0.22.x; we're going to have 0.21.x-C65 only contain the Chromium upgrade 😄 👍

[srirambv]

Verified on muon 5.1.0 built from source rev aa9db3c

[kjozwiak]

Verified that the above issue has been fixed on macOS 10.13.3 x64 using the following build:

• 0.22.6 e6ff4ea
• libchromiumcontent: 65.0.3325.162
• muon: 5.1.0

Verified on Ubuntu 10.10 x64

• 0.22.7 8bb7e77
• libchromiumcontent: 65.0.3325.181
• muon: 5.1.1