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

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https://hg.mozilla.org/integration/gaia-central/rev/a378b9d1db68
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #26359 from wilsonpage/1102138

Bug 1102138 - [gaia-header] Should no longer reverse content in RTL mode

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https://hg.mozilla.org/integration/gaia-central/rev/a628ca8b272e
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 1102138 - [gaia-header] Should no longer reverse content in RTL mode

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "c759db1bcc0798ec0ff1e5796ffbfe3bbca63346", 
+    "revision": "a378b9d1db687e0e65d33270a4880a7911a063a9", 
     "repo_path": "integration/gaia-central"
 }