[Cocoa] WebProcess doesn't follow localization of UI process when run as a service

[Cocoa] WebProcess doesn't follow localization of UI process when run as a service
https://bugs.webkit.org/show_bug.cgi?id=133126
<rdar://problem/13396515>

Patch by Alexey Proskuryakov.
Reviewed by Tim Horton.

* Configurations/WebContentService.Development.xcconfig:
* Configurations/WebContentService.xcconfig:
Figure out which of the two keys to use. CFBundleAllowMixedLocalizations was
a workaround before we got CFBundleFollowParentLocalization, and these cannot be
used together.

* UIProcess/Launcher/mac/ProcessLauncherMac.mm: (WebKit::connectToService): Set up
XPC bootstrap for CFBundle to use.

* WebKit2.xcodeproj/project.pbxproj: Added a script that applies the key to Info.plist.

* WebProcess/EntryPoint/mac/XPCService/WebContentService.Development/Info-OSX.plist:
* WebProcess/EntryPoint/mac/XPCService/WebContentService.Development/Info-iOS.plist:
* WebProcess/EntryPoint/mac/XPCService/WebContentService/Info-OSX.plist:
* WebProcess/EntryPoint/mac/XPCService/WebContentService/Info-iOS.plist:
Removed CFBundleAllowMixedLocalizations, we now add it programmatically.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@170653 268f45cc-cd09-0410-ab3c-d52691b4dbfc