Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/15a97e0f7bff
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #23646 from eliperelman/bug-1059967

Bug 1059967 - Updating SHB to conform to UX v1.0 spec r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/4202799a61fe
Author: Eli Perelman <eli@eliperelman.com>
Desc: Bug 1059967 - Updating SHB to conform to UX v1.0 spec

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https://hg.mozilla.org/integration/gaia-central/rev/eaac8d30c1e1
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #23925 from mikehenrty/bug-1065419-gallery-theme

Bug 1065419 - Add theme color to gallery

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https://hg.mozilla.org/integration/gaia-central/rev/2674de61d2b3
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1065419 - Add theme color to gallery

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https://hg.mozilla.org/integration/gaia-central/rev/7b4db54d8339
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #23924 from mikehenrty/bug-1065420-camera-theme

Bug 1065420 - Add theme color to camera

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https://hg.mozilla.org/integration/gaia-central/rev/1a2644780a2a
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1065420 - Add theme color to camera

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "e89bb80f31d875cd5efa1e025eefd54732764c91", 
+    "revision": "15a97e0f7bff562ca7f8c094ef53b2a02477724e", 
     "repo_path": "/integration/gaia-central"
 }