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

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https://hg.mozilla.org/integration/gaia-central/rev/2b76279a1d07
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #23214 from davidflanagan/bug1051172-v2.1

Merge pull request #23118 from davidflanagan/bug1051172-v2.0

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https://hg.mozilla.org/integration/gaia-central/rev/bb8982676d78
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #23118 from davidflanagan/bug1051172-v2.0

Bug 1051172: a stoprecording event hack so the camera can stop recording more quickly on app transitions. r=kgrandon,justindarc a=2.0+(cherry picked from commit 4ea69f01f52f472331d12b001ec1e37631bff575)

Conflicts:

	apps/camera/index.html
	apps/camera/js/app.js
	apps/camera/js/config/require.js
	apps/camera/js/controllers/camera.js
	apps/camera/test/unit/setup.js
	apps/system/js/app_window_manager.js

remove unused listenForAttentionScreen function

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https://hg.mozilla.org/integration/gaia-central/rev/2e11af032c27
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #23167 from mikehenrty/bug-1041903-dialer-theme-revisit

Bug 1041903 - Fix theme color for dialer again

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https://hg.mozilla.org/integration/gaia-central/rev/c397543db97c
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1041903 - Fix theme color for dialer again
Bumping manifests a=b2g-bump