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

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https://hg.mozilla.org/integration/gaia-central/rev/a02c4aa4eafa
Author: Min-Zhong "John" Lu <jlu@mozilla.com>
Desc: Merge pull request #24206 from mnjul/bug_1063461_kb_manager_cleanup

Bug 1063461 - de-xfail keyboard_manager.js and annotate private members. r=rudyl

- Remove keyboard_manager.js from js linter xfail list (and make it jshint-compliant)
- Annotate private members of keyboard_manager.js with underscore-prefix

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https://hg.mozilla.org/integration/gaia-central/rev/994a0b438dee
Author: John Lu [:mnjul] <jlu@mozilla.com>
Desc: Bug 1063461 - de-xfail keyboard_manager.js and annotate private members

- Remove keyboard_manager.js from js linter xfail list (and make it jshint-compliant)
- Annotate private members of keyboard_manager.js with underscore-prefix
Bumping manifests a=b2g-bump