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

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https://hg.mozilla.org/integration/gaia-central/rev/e6744166ac5e
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #23917 from KevinGrandon/bug_1065658_search_app_closes_background

Bug 1065658 - [Rocketbar] Do not hide search window if app launches in background

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https://hg.mozilla.org/integration/gaia-central/rev/18940ea8c597
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1065658 - [Rocketbar] Do not hide search window if app launches in background r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/5d9ccd719104
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #23827 from ehsan/1064593

Bug 1064593 - Pass the activity name used in the loop client app as a string in order to make it easier to automatically extract the activity name from the source code. r=francisco

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https://hg.mozilla.org/integration/gaia-central/rev/054e602fdaad
Author: Ehsan Akhgari <ehsan@mozilla.com>
Desc: Bug 1064593 - Pass the activity name used in the loop client app as a string in order to make it easier to automatically extract the activity name from the source code; r=ferjm
Bumping manifests a=b2g-bump