Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/6238380e300e
Author: Eli Perelman <eli@eliperelman.com>
Desc: Merge pull request #29651 from eliperelman/bug-1156995

Bug 1156995 - Set GAIA_OPTIMIZE=1 by default with raptor profile

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https://hg.mozilla.org/integration/gaia-central/rev/26627eb2c940
Author: Eli Perelman <eli@eliperelman.com>
Desc: Bug 1156995 - Set GAIA_OPTIMIZE=1 by default with raptor profile

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https://hg.mozilla.org/integration/gaia-central/rev/c0098699168b
Author: No-Jun Park <npark@mozilla.com>
Desc: Merge pull request #29669 from npark-mozilla/1157326

Bug 1157326 - test_lockscreen_unlock_to_homescreen_with_passcode.py in Imagecompare needs to be updated

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https://hg.mozilla.org/integration/gaia-central/rev/5b6a56092c2c
Author: No-Jun Park <npark@mozilla.com>
Desc: Bug 1157326 - test_lockscreen_unlock_to_homescreen_with_passcode.py in Imagecompare needs to be updated

switching to root frame is required upon every screen wake

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https://hg.mozilla.org/integration/gaia-central/rev/10c469d4ab52
Author: No-Jun Park <npark@mozilla.com>
Desc: Merge pull request #29668 from npark-mozilla/1155299

Bug 1155299 - Update manifest file for imagecompare (i.e. defined smoke tests)

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https://hg.mozilla.org/integration/gaia-central/rev/2d099084573b
Author: No-Jun Park <npark@mozilla.com>
Desc: Bug 1155299 - Update manifest file for imagecompare

Remove tests that are redundant

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "04ccfe95763b230d19da825fe715351e629649d0", 
+        "git_revision": "9d4f756aa35cb7f030a92f3c1f65fb55254ddd1d", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "ccfa36f6da553e92d041eee2d6f983e0558911e0", 
+    "revision": "6238380e300e25c4ec8aea2a8804d0ca3675f7fb", 
     "repo_path": "integration/gaia-central"
 }