Bug 1004329 - [Flatfish][Homescreen] Returning home (landscape) from portrait app causes app icons to misalign/overlap

* Fix ScreenHelper width/height error due to mediaQueryListener being fired twice right after maketplace app closed.
Bug 1053728 - App icon size incorrect from rocket bar search result
Add 'browsing' icon to shared/icons.css
Bug 938177 - Add 'browsing' icon to shared/icons.css r=kgrandon
Revert "Add 'browsing' icon to shared/icons.css"

This reverts commit 0e53c0e2b5f4cfc2e2c9498427034156a20b6551.
Bug 938177 - Add 'browsing' icon to shared/icons.css r=kgrandon
Merge pull request #22920 from shamenchens/Bug1053728-RocketBarSearch

Bug 1053728 - App icon size incorrect from rocket bar search result, r=kgrandon
Merge pull request #22025 from begeeben/1004329_returning_home

Bug 1004329 - [Flatfish][Homescreen] Returning home (landscape) from portrait app causes app icons to misalign/overlap, r= Cristian Rodriguez (:crdlc)

* Fix ScreenHelper width/height error due to mediaQueryListener being fired twice right after maketplace app closed.