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

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https://hg.mozilla.org/integration/gaia-central/rev/70cb8b50e7ad
Author: gitmai <mri@tid.es>
Desc: Merge pull request #20230 from gitmai/bug-1022641-load-of-message-handler

Bug 1022641 - Message handler is not allways loaded when the app is laun...
r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/c27c0720302d
Author: mai <mri@tid.es>
Desc: Bug 1022641 - Message handler is not allways loaded when the app is launched

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https://hg.mozilla.org/integration/gaia-central/rev/f6a97c33fdcf
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #20201 from dmarcos/bug1020560

Bug 1020560 - [B2G][Camera]Quickly switching between camera and video mo...

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https://hg.mozilla.org/integration/gaia-central/rev/4f3bc5c0441f
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Bug 1020560 - [B2G][Camera]Quickly switching between camera and video mode causes the camera to freeze
Bumping manifests a=b2g-bump