Fixed default browser setting Ubuntu

[CliqueBait]

Test Plan

1. Make sure you don't have gawk installed on linux
2. Make sure Brave is ont your default browser
3. Install Brave
4. Launch Brave and set it as default browser in app
5. Brave should be your default browser

Original issue description

Brave: 0.13.5
rev: 1db81cb
Muon: 2.56.8
libchromiumcontent: 56.0.2924.87
V8: 5.6.326.50
Node.js: 7.4.0
Update Channel: dev
os.platform: linux
os.release: 4.8.0-42-generic
os.arch: x64

I recently switched from using Ubuntu/Unity to Ubuntu/XFCE. I have Brave set as the default browser but Brave doesn't seem able to recognise this on startup so I get prompted about that every single startup. However, other applications do start Brave or use an existing instance when opening urls.

[jonathansampson]

Confirmed.

[cndouglas]

Based on @jonathansampson's screencast (Unity), this may be a problem with any desktop environment on Ubuntu.

[jonathansampson]

@bbondy Reported seeing this as well. @darkdh was able to repro with a fresh install.

[CliqueBait]

I don't think this is fixed. Also, is step 1 of the Test Plan really asking me to uninstall gawk (a core utility in linux systems) ?

[darkdh]

Sorry, the test steps is a little confusing.
Step 1 is make sure you don't have gawk in your system. When you install Brave, it will show you that you need to install gawk as dependency.
Before this, we didn't ask user to install gawk. So it will fail to set as default silently.