Bug 1037213: extended imgIRequest with an imageErrorCode attribute and modified imgRequest::OnStopRequest to preserve the actual error code when NS_FAILED(status) (r=seth)
Bug 1029887: Keep track of DOM nodes blocked by NS_ERROR_TRACKING_URI (r=khuey,smaug)
Bug 1029887: Test DOM nodes blocked by NS_ERROR_TRACKING_URI (r=mmc)
Bug 1038897: pop entries off the cache until its size reaches max cache size. Input read from corresponding pref is clamped to non-negative values (r=seth)