Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/eba9317dd07a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 996252 - Intermittent TEST-UNEXPECTED-FAIL | test_settings_change_language.py test_settings_change_language.TestChangeLanguage.test_change_language_settings | after TimeoutException: Timed out after 10.0 seconds

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https://hg.mozilla.org/integration/gaia-central/rev/ea354ee2dc47
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #17901 from rsajdok/bug#989389

Bug 989389: Confirmation messages when setting or un-setting mutliple em... r=jrburke

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https://hg.mozilla.org/integration/gaia-central/rev/88a4dcfc34e2
Author: Robert Sajdok <robert.sajdok@gmail.com>
Desc: Bug 989389: Confirmation messages when setting or un-setting mutliple email flags are grammatically incorrect.
Bumping manifests a=b2g-bump