[Merge] lp:~osomon/webbrowser-app/generate-ua-overrides into lp:webbrowser-app

[system-apps-ci-bot]

Review: Needs Fixing continuous-integration

FAILED: Continuous integration, rev:1479
https://jenkins.canonical.com/system-apps/job/lp-webbrowser-app-ci/557/
Executed test runs:

Click here to trigger a rebuild:
https://jenkins.canonical.com/system-apps/job/lp-webbrowser-app-ci/557/rebuild

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https://code.launchpad.net/~osomon/webbrowser-app/generate-ua-overrides/+merge/297199
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