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

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https://hg.mozilla.org/integration/gaia-central/rev/02cec9fa575a
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #13825 from dwi2/bug940162

Bug 940162 - Modify params passing to SimPinDialog.show in order to accommodate recent change r=kaze

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https://hg.mozilla.org/integration/gaia-central/rev/49feca9e72fd
Author: tzhuang <tzhuang@mozilla.com>
Desc: Bug 940162 - Modify passing params of SimPinDialog.show in order to accommodate recent change

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https://hg.mozilla.org/integration/gaia-central/rev/d2554196b5e4
Author: Reuben Morais <reuben.morais@gmail.com>
Desc: Merge pull request #13853 from bgirard/HomescreenBorder

Bug 939392 - Remove invisible border for better performance. r=crdlc

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https://hg.mozilla.org/integration/gaia-central/rev/f75718f1c62d
Author: Benoit Girard <b56girard@gmail.com>
Desc: Bug 939392 - Remove invisible border for better performance. r=crdlc

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "2d81ea943bc1cfa75f7fd49c9b4c64095e666491", 
+    "revision": "02cec9fa575abbb0b71460fe8194e5e35cec720c", 
     "repo_path": "/integration/gaia-central"
 }