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

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https://hg.mozilla.org/integration/gaia-central/rev/4e51b8e5eec1
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1161095 - merge pull request #30002 from etiennesegonzac:bug-1161095 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/deee98319626
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 1161095 - Don't prompt on theme-app uninstall. r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/faf3329ffd8b
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1162264 - merge pull request #30050 from Cwiiis:bug1162264-dont-allow-early-longpress to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/c5c245bf36ee
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1162264 - Don't allow initiation of long-press during drag. r=kgrandon

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "7b660dc21aaf05d838f64e01a1f1e4374c03ad59", 
+        "git_revision": "f75abf8b9bd8ad567f987ca0511e9b692f7ec986", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "baaf94aa13cd5363609ba707962f8fadd8495dd8", 
+    "revision": "4e51b8e5eec1eb07e739a57d04c1033c17ef00ad", 
     "repo_path": "integration/gaia-central"
 }