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

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https://hg.mozilla.org/integration/gaia-central/rev/a34f4a8e36c1
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #11919 from huchengtw-moz/camera/Bug_911669_flash_state_is_different

Bug 911669 - [B2G][Helix][Camera][ouyangming] The flash's state is diffe..., r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/3842b9126a1a
Author: John Hu <johu@mozilla.com>
Desc: Bug 911669 - [B2G][Helix][Camera][ouyangming] The flash's state is different between the android device when do the same operation

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https://hg.mozilla.org/integration/gaia-central/rev/9bd509c6a180
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #11918 from huchengtw-moz/video/Bug_909374_improve_view_activity_saving_feature_robustness

Bug 909374 - [Video] Improve view activity saving feature robustness, r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/42ab4bf5b07b
Author: John Hu <johu@mozilla.com>
Desc: Bug 909374 - [Video] Improve view activity saving feature robustness

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "4162cfae8bcdb6d9f7b136fdbc28723407fc5a65", 
+    "revision": "a34f4a8e36c11b65d96d26423a0d54bf3b574855", 
     "repo_path": "/integration/gaia-central"
 }