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

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https://hg.mozilla.org/integration/gaia-central/rev/19a54c7df636
Author: Guillaume C. Marty <edo999@gmail.com>
Desc: Merge pull request #22574 from gmarty/Bug-1042105-Icon-prioritization-Dual-Status-bar

Bug 1042105 - [User Story] Icon prioritization in the status bar

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https://hg.mozilla.org/integration/gaia-central/rev/1a54064e462f
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1042105 - [User Story] Icon prioritization in the status bar

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https://hg.mozilla.org/integration/gaia-central/rev/adde8b85ebc2
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Merge pull request #22671 from gtorodelvalle/callscreen-bug-1050196-place-second-call-button-status

Bug 1050196 - [Dialer] Follow up of bug 1024506 - Place new call button momentarily enabled while establishing a second call

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https://hg.mozilla.org/integration/gaia-central/rev/004c5b67a2d6
Author: German Toro del Valle <gtorodelvalle@gmail.com>
Desc: Bug 1050196 - [Dialer] Follow up of bug 1024506 - Place new call button momentarily enabled while establishing a second call

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "ac1500422cf1f7aef6052ce7a2a3204ef6ddc644", 
+    "revision": "19a54c7df63663138088bb48520c5578bc647a81", 
     "repo_path": "/integration/gaia-central"
 }