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

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https://hg.mozilla.org/integration/gaia-central/rev/fbf868517b30
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #19075 from jrburke/bug1007845-email-calendar-en-whitespace

Bug 1007845 - Fix whitespace removals from en-US locale files r=asuth,gaye

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https://hg.mozilla.org/integration/gaia-central/rev/1dd027af203e
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1007845 - Fix whitespace removals from en-US locale files from bug 940512 and bug 940132

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https://hg.mozilla.org/integration/gaia-central/rev/edb3144bb169
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #19061 from crdlc/bug-1007147

Bug 1007147 - Fit visual details to icon's label

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https://hg.mozilla.org/integration/gaia-central/rev/fa0b1d16f8c4
Author: crdlc <crdlc@tid.es>
Desc: Bug 1007147 - Fit visual details to icons label
Bumping manifests a=b2g-bump