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

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https://hg.mozilla.org/integration/gaia-central/rev/9466d277f043
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Merge pull request #31132 from gabrielesvelto/bug-1174380-fix-ignore-button

Bug 1174380 - Hide the hangup button when receiving a second call and properly align the ignore button r=drs

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https://hg.mozilla.org/integration/gaia-central/rev/a1d6bc7e28af
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Bug 1174380 - Hide the hangup button when receiving a second call and properly align the ignore button r=drs

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https://hg.mozilla.org/integration/gaia-central/rev/73c9024a9dc7
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #31130 from tdz/bug-1188310

Bug 1188310 - Use 'nodejs' tool for Node.js on Debian 7. r=mwu

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https://hg.mozilla.org/integration/gaia-central/rev/d972b2bea2b4
Author: Thomas Zimmermann <tdz@users.sourceforge.net>
Desc: Bug 1188310: Use 'nodejs' tool for Node.js on Debian 7

The tool 'node' seems to be called 'nodejs' on Debian 7. This patch
prepares the Makefile to handle this case.

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "0cc109495bf06060e66f993255ab8a23fcfe347b", 
+        "git_revision": "d77579a3d6224ceefcdf26b7d2a9785a2de45c87", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "8e7f28747704d2dab35be829162a2a4482e97b54", 
+    "revision": "9466d277f0433a099ea83b890981999f7c530b07", 
     "repo_path": "integration/gaia-central"
 }