[Merge] lp:~gcollura/content-hub/fix-1384490 into lp:content-hub

[Michael Hall]

Not having a proper way to change the ContentPeerPicker colors makes it less ideal for apps that define their own colors. Which means those developers will either avoid using it and roll their own, or do some nasty hacks to force it to change color (I'm currently doing the later).

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https://code.launchpad.net/~gcollura/content-hub/fix-1384490/+merge/240156
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