Backed out changeset f8b656efb478 (bug 940844)

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rename : browser/themes/linux/syncProgress-toolbar.png => browser/themes/linux/sync-24-throbber.png
Bug 969125 - Australis: [Linux] Sync toolbar button disappears during synchronization. r=Gijs DONTBUILD (fixed commit message)

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rename : browser/themes/linux/sync-24-throbber.png => browser/themes/linux/syncProgress-toolbar.png