Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/7b70ba3655ab
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #23293 from KevinGrandon/bug_1054556_popup_page_height

Bug 1054556 - Fix page height for popup windows

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https://hg.mozilla.org/integration/gaia-central/rev/f00e1e12172a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1054556 - Fix page height for popup windows r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/e374e684b28e
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #23162 from KevinGrandon/bug_1055761_system_app_window_origin_match_alternate

Bug 1055761 - Navigating to a URL can incorrectly switch to an existing browser window

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https://hg.mozilla.org/integration/gaia-central/rev/e6e0458ed224
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1055761 - Navigating to a URL can incorrectly switch to an existing browser window r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/bb45bb56f153
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #23213 from KevinGrandon/bug_1055688_rename_browser2_browser

Bug 1055688 - Rename "Browser2" to "Browser"

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https://hg.mozilla.org/integration/gaia-central/rev/269101476b7c
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1055688 - Rename "Browser2" to "Browser" r=kgrandon
Bumping manifests a=b2g-bump