Display an error message to the user if Brave Ads are not supported due to missing system components

[tmancey]

Description

Steps to Reproduce

1. Install Mint Linux 17.0

Actual result:

Blinded tokens fail to generate and Brave Ads are not delivered

Expected result:

Blinded tokens are generated and Brave Ads are delivered

Reproduces how often:

Easily reproduced

Brave version (brave://version info)

Version/Channel Information:

• Can you reproduce this issue with the current release? Yes
• Can you reproduce this issue with the beta channel? Yes
• Can you reproduce this issue with the nightly channel? Yes

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields? N/A
• Does the issue resolve itself when disabling Brave Rewards? N/A
• Is the issue reproducible on the latest version of Chrome? N/A

Miscellaneous Information:

Brave Ads are delivered on Mint Linux 17.3

[tmancey]

Closing issue as supersceded by #9592