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

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https://hg.mozilla.org/integration/gaia-central/rev/740e8e72e79e
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #25394 from pivanov/bug-994681

Bug 994681 - [video] White outline offset to play button background

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https://hg.mozilla.org/integration/gaia-central/rev/246cfe0185e3
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 994681 - [video] White outline offset to play button background

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https://hg.mozilla.org/integration/gaia-central/rev/ecb6fb730d8a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #25472 from KevinGrandon/bug_1088389_search_divider

Bug 1088389 - [Search] Remove divider shown when searching

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https://hg.mozilla.org/integration/gaia-central/rev/fb9ee0decee9
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1088389 - [Search] Remove divider shown when searching r=daleharvey
Bumping manifests a=b2g-bump