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

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https://hg.mozilla.org/integration/gaia-2_0/rev/75842fbd4e37
Author: Luke Chang <lchang@mozilla.com>
Desc: Bug 1082456 - The buttons of the fullscreen permission dialog become "Don't share / Share" abnormally after the geolocation permission dialog is shown previously

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https://hg.mozilla.org/integration/gaia-2_0/rev/96839059efdb
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 1065731 - When adding a number to an existing contact, search icon does nothing

Conflicts:
	shared/pages/import/style/search.css

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https://hg.mozilla.org/integration/gaia-2_0/rev/26837a0cea27
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 1073484 - [GAIA][Contacts]Edit two times in contact search result in improper contact data

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https://hg.mozilla.org/integration/gaia-2_0/rev/8cf52bf0538b
Author: Sherman Chen <shamen.chens@gmail.com>
Desc: Bug 1070865 - Fix incorrect resize within popup window
Bumping manifests a=b2g-bump