Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/f446053df7cc
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #23008 from KevinGrandon/bug_1052503_system_progress_bar

Bug 1052503 - [Rocketbar] Update loading progress bar

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https://hg.mozilla.org/integration/gaia-central/rev/76b7bd1e82c9
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1052503 - [Rocketbar] Update loading progress bar r=benfrancis

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "f77fe1adb0cd493914bcbcb281e3f4fd40e3ee87", 
+    "revision": "f446053df7ccb21e77b385e98ab96e04372978a1", 
     "repo_path": "/integration/gaia-central"
 }