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

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https://hg.mozilla.org/integration/gaia-central/rev/e7fc7e6bbdf8
Author: Evan Tseng <itoyxd@gmail.com>
Desc: Merge pull request #26281 from evanxd/bug-1101407

Bug 1101407 - Use correct commit hash

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https://hg.mozilla.org/integration/gaia-central/rev/e39531775dd0
Author: Evan Xd <itoyxd@gmail.com>
Desc: Bug 1101407 - Use correct commit hash

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https://hg.mozilla.org/integration/gaia-central/rev/6534a45b81f4
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #26253 from wilsonpage/1092960

Bug 1092960 - Camera app to follow text selection pattern

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https://hg.mozilla.org/integration/gaia-central/rev/3f41b8b46c3f
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 1092960 - Camera app to follow text selection pattern
Bumping manifests a=b2g-bump