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

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https://hg.mozilla.org/integration/gaia-central/rev/26f5b8ed569f
Author: Ben Francis <ben@tola.me.uk>
Desc: Merge pull request #15776 from benfrancis/907104

Bug 907104 - Make it possible to move the cursor the last character in the URL bar r=daleharvey

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https://hg.mozilla.org/integration/gaia-central/rev/f3a39ff43276
Author: Ben Francis <ben@tola.me.uk>
Desc: Bug 907104 - Make it possible to move the cursor the last character in the URL bar
Bumping manifests a=b2g-bump