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

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https://hg.mozilla.org/integration/gaia-central/rev/e2e758caa9d5
Author: Martijn <martijn.martijn@gmail.com>
Desc: Merge pull request #31826 from mwargers/1201870

Bug 1201870 - Remove is_element_displayed and is_element_present from gaia_test.py

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https://hg.mozilla.org/integration/gaia-central/rev/ea13f8c4dcf5
Author: Martijn Wargers <mwargers@mozilla.com>
Desc: Bug 1201870 - Remove is_element_displayed and is_element_present from gaia_test.py

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https://hg.mozilla.org/integration/gaia-central/rev/551b5c9e7911
Author: Martijn <martijn.martijn@gmail.com>
Desc: Merge pull request #31816 from mwargers/1202867

Bug 1202867 - Move test_settings_usb_storage.py to the last spot, because it can cause failures in other tests

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https://hg.mozilla.org/integration/gaia-central/rev/33246835facb
Author: Martijn Wargers <mwargers@mozilla.com>
Desc: Bug 1202867 - Move test_settings_usb_storage.py to the last spot, because it can cause failures in other tests

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "e4490110b43c7636d0e34760ff2bf8eeef5ee9d2", 
+        "git_revision": "6d0afb71d0fe7185fbec2690d7716632083cc504", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "2a01d69a2fdb5113fde1bb3f4de51085c47b1520", 
+    "revision": "e2e758caa9d5c2c743abfee65895c14174ab1976", 
     "repo_path": "integration/gaia-central"
 }