Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/ec26c0a5b504
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #17738 from yurenju/stage-windows-squash-3

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/74499fc25baa
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

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "84dbd52b4ab122cd2aae804c526905f21c18c6cf", 
+    "revision": "ec26c0a5b5049d0e8d25299b83058daf11c7289a", 
     "repo_path": "/integration/gaia-central"
 }