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

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https://hg.mozilla.org/integration/gaia-central/rev/9fc2a79c615a
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #17510 from yurenju/stage3

Bug 897352 - [gaia build system] Transition to a build_stage for assembl... r=@ochameau

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https://hg.mozilla.org/integration/gaia-central/rev/26e9ea2e0fbc
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 897352 - [gaia build system] Transition to a build_stage for assembling apps

Conflicts:
	Makefile
	apps/communications/build/build.js
	build/copy-build-stage-manifest.js
	build/test/integration/distribution.test.js
	build/utils-xpc.js
	build/utils.js
	build/webapp-manifests.js

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https://hg.mozilla.org/integration/gaia-central/rev/297745511a1a
Author: gitmai <mri@tid.es>
Desc: Merge pull request #17474 from gitmai/bug-986473-CC-modify-parameters

Bug 986473 -Modify cost control parameters
r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/9c49ef2d5808
Author: mai <mri@tid.es>
Desc: Bug 986473 -Modify cost control parameters

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "branch": "", 
         "revision": ""
     }, 
-    "revision": "9deb1e43dd2e583b812b26708c31e772eeae9c3b", 
+    "revision": "9fc2a79c615a72c15c995ffc342e574b342a6e60", 
     "repo_path": "/integration/gaia-central"
 }