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

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https://hg.mozilla.org/integration/gaia-central/rev/907e1c00ad7b
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1146446 - merge pull request #29102 from julienw:1146446-fix-draft-style to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/d3bf4e44f27d
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1146446 - [Messages] "New message" drafts do not have the right style r=schung

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "a8256b632f571b2ed45129213490e14a86e15c7f", 
+        "git_revision": "68a3b74e4e5c3b8fa5c66a5e65369b5af91d73b4", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "c895074895720ed529b54cbe12d42bc697af7538", 
+    "revision": "907e1c00ad7b0d9f5a1c64644216395ee30fe111", 
     "repo_path": "integration/gaia-central"
 }