Bug 909712 - Partner repack changes for web.de, gmx, and mail.com (Firefox 24) - r=bhearsum

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rename : partners/gmx/distribution/extensions/toolbar@gmx.net/content/main/brand-var-loader.js => partners/gmx/distribution/extensions/toolbar@gmx.net/content/util/brand-var-loader.js
rename : partners/mail.com/distribution/extensions/toolbar@mail.com/content/main/brand-var-loader.js => partners/mail.com/distribution/extensions/toolbar@mail.com/content/util/brand-var-loader.js
rename : partners/web.de/distribution/extensions/toolbar@web.de/content/main/brand-var-loader.js => partners/web.de/distribution/extensions/toolbar@web.de/content/util/brand-var-loader.js