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

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https://hg.mozilla.org/integration/gaia-central/rev/cbaa49bbefdc
Author: gitmai <mri@tid.es>
Desc: Merge pull request #21257 from gitmai/bug-1032836-event-listener-error-testing

Bug 1032836 - Intermittent image_loader_test.js | Image Loader Test Suit...
r=crdlc

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https://hg.mozilla.org/integration/gaia-central/rev/ec9aabc8f53c
Author: mai <mri@tid.es>
Desc: Bug 1032836 - Intermittent image_loader_test.js | Image Loader Test Suite > imgsLoader resuming > resuming calls new Image() | expected Image to be called once but was called twice
Bumping manifests a=b2g-bump