Bug 875248 - New unit tests for wallpaper.js
Bug 877990 - Adding minimum delay between automatic requests to respect performance limits
Merge pull request #10166 from lodr/bug-877990-performance-limits

Bug 877990 - Adding minimum delay between automatic requests to respect performance limits.
r=@jmcanterafonseca
Merge pull request #10035 from crdlc/bug-875248

Bug 875248 - New unit tests for wallpaper.js
Revert "Merge pull request #10166 from lodr/bug-877990-performance-limits"

This reverts commit 742caa314f950159603a92e08b423b76486f7ffe, reversing
changes made to f9318db4067b23842b3ac16bc2956a6e3c38e306.