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

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https://hg.mozilla.org/integration/gaia-central/rev/f3c9f1e04951
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #14156 from gasolin/issue-942704

Bug 942704 - [Status bar] Followup of bug 936201, considering activity, r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/e0fc4c576c9b
Author: gasolin <gasolin@gmail.com>
Desc: Bug 942704 - [Status bar] Followup of bug 936201, considering activity.

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https://hg.mozilla.org/integration/gaia-central/rev/f66a273dac78
Author: evelynhung <jj.evelyn@gmail.com>
Desc: Merge pull request #14299 from pivanov/bug-911968

Bug 911968 - [HD]Center rotation point of refresh icon off, r=evelyn

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https://hg.mozilla.org/integration/gaia-central/rev/c974b6cf6c38
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 911968 - [HD]Center rotation point of refresh icon off