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

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "8c80a19ce9a01276a7794db4f5779961f82cd35a", 
+    "revision": "7b70ba3655ab01b351122ccf56c858c77fc255f2", 
     "repo_path": "/integration/gaia-central"
 }