Bug 962103 - Make progress bar overlap content. r=lucasr

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extra : rebase_source : 81e81fa285f34243a1fbb8489d1d6d9893429159
Bug 962103 - Fix progress bar visibility on pre-Honeycomb devices. r=lucasr

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extra : rebase_source : ae10c57b04012d3c746fbaaaa2838ea230b32b58