Bug 988536 - InContent preferences needs icons for headers and arrows. r=jaws

--HG--
rename : browser/themes/osx/preferences/in-content/check.png => browser/themes/shared/incontentprefs/check.png
rename : browser/themes/osx/preferences/in-content/check@2x.png => browser/themes/shared/incontentprefs/check@2x.png
rename : browser/themes/osx/preferences/in-content/dropdown-disabled.png => browser/themes/shared/incontentprefs/dropdown-disabled.png
rename : browser/themes/osx/preferences/in-content/dropdown.png => browser/themes/shared/incontentprefs/dropdown.png
rename : browser/themes/osx/preferences/in-content/icons.png => browser/themes/shared/incontentprefs/icons.png
rename : browser/themes/osx/preferences/in-content/icons@2x.png => browser/themes/shared/incontentprefs/icons@2x.png
rename : browser/themes/shared/in-content/preferences.css => browser/themes/shared/incontentprefs/preferences.css
rename : browser/themes/osx/preferences/in-content/sorter.png => browser/themes/shared/incontentprefs/sorter.png
Bug 991168 - Increase the default width of the request details pane r=vporof
Bug 993802 - Re-enable browser_save_private_link_perwindowpb.js on Linux which bug 987404 accidentally re-disabled. r=markh
Bug 993299 - Australis - There is no minimum width set in customization mode. r=mconley
Bug 991636 - Fix toolkit/devtools/server/tests/mochitest/test_connectToChild.html test. r=msucan