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

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https://hg.mozilla.org/integration/gaia-central/rev/bb53d392c2ce
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #27617 from eeejay/bug-1068980

Bug 1068980 - Moved the fullscreen back button above the image frames ta... r=pdahiya

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https://hg.mozilla.org/integration/gaia-central/rev/770ba53fe981
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 1068980 - Moved the fullscreen back button above the image frames tag.

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https://hg.mozilla.org/integration/gaia-central/rev/6d63e438e7a8
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #26955 from eeejay/bug-1068973

Bug 1068973 - Groups headers above, and footers below thumbnails. r=pdahiya

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https://hg.mozilla.org/integration/gaia-central/rev/9c03c921f616
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 1068973 - Put headers above, and footers below thumbnails.

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "41fe4d8ff55e03f777b4f06c313a500c9a089441", 
+        "git_revision": "8238eeacc7030b2cdbf7ab4eba2f36779b702599", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "ff5f77c969610d5c889b6838209105a6fef58507", 
+    "revision": "bb53d392c2cecade936a413adac183cc2f8dc254", 
     "repo_path": "integration/gaia-central"
 }