Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/0d5ff1b920bd
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 938177 - Add 'browsing' icon to shared/icons.css r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/ec65eac89d7b
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Add 'browsing' icon to shared/icons.css"

This reverts commit 0e53c0e2b5f4cfc2e2c9498427034156a20b6551.

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https://hg.mozilla.org/integration/gaia-central/rev/5f2b187797b4
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 938177 - Add 'browsing' icon to shared/icons.css r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/cb731e1f403e
Author: Wilson Page <wilsonpage@me.com>
Desc: Add 'browsing' icon to shared/icons.css
Bumping manifests a=b2g-bump