Bug 1280510 - Copy hi/lo dpi loading icon from windows to Linux. r=dao
MozReview-Commit-ID: FraPEDKnQAQ
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rename : toolkit/themes/windows/global/icons/loading.png => toolkit/themes/shared/icons/loading.png
rename : toolkit/themes/windows/global/icons/loading@2x.png => toolkit/themes/shared/icons/loading@2x.png