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

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https://hg.mozilla.org/integration/gaia-central/rev/396759500e67
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Merge pull request #32468 from Cwiiis/bug1215056-new-homescreen-pages-order

Bug 1215056 - Respect pinned page order. r=gmarty

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https://hg.mozilla.org/integration/gaia-central/rev/b23cb9efbfb9
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1215056 - Respect pinned page order. r=gmarty

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https://hg.mozilla.org/integration/gaia-central/rev/c32abbb461e7
Author: albertopq <albert.pastor@gmail.com>
Desc: Merge pull request #32415 from albertopq/1212700-trigger-select

Bug 1212700 - Synchronously preventing event on mozbrowsercontextmenu r=mhenretty

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https://hg.mozilla.org/integration/gaia-central/rev/d8dd093afb25
Author: albertopq <albert.pastor@gmail.com>
Desc: Bug 1212700 - Synchronously preventing event on mozbrowsercontextmenu

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "8a3f4ee540ebb5afbdc00047910cc689a2f400a2", 
+        "git_revision": "645a18a3aa5e58b68ba9378c6b029cd2c5c70c8e", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "b4e65a4d414c3788454d8ec9f6a629083415d0db", 
+    "revision": "396759500e67ed8dbde7031f85c4980220a4b82b", 
     "repo_path": "integration/gaia-central"
 }