Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/d25f3c113e35
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #20431 from zacc/bug_1024433

Bug 1024433 - Update displayedApp atom to handle activityWindows

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https://hg.mozilla.org/integration/gaia-central/rev/a3a2d9802dc3
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1024433 - Update displayedApp atom to handle activityWindows
Bumping manifests a=b2g-bump