Bumping gaia.json for 4 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/abcc2f6a74c6
Author: Sam Joch <samuel@guiora.com>
Desc: Merge pull request #11672 from pivanov/bug-907882

Bug 907882 - [Email] [HD] Search text field box - Wrong clear icon r=samjoch

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https://hg.mozilla.org/integration/gaia-central/rev/17632193d269
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 907882 - [Email] [HD] Search text field box - Wrong clear icon

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https://hg.mozilla.org/integration/gaia-central/rev/bbc031c3da6a
Author: Ian Liu <iliu@mozilla.com>
Desc: Merge pull request #11752 from ian-liu/bluetooth/Bug908124_handle_ActivityCanceled_and_NO_PROVIDER_event_correctly

Bug 908124 - An error message is shown after successfully open a received photo and click 'home' key. r=@alivedise

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https://hg.mozilla.org/integration/gaia-central/rev/468fe73e59ec
Author: ian-liu <iliu@mozilla.com>
Desc: Bug 908124 - An error message is shown after successfully open a received photo and click 'home' key.