Remove unused MessagateStateViewModel

WordPress/Classes/ViewRelated/Domains/View Models/SiteDomainsViewModel.swift

@@ -198,15 +198,4 @@ extension SiteDomainsViewModel {
         let footer: String?
         let content: SectionKind
     }
-
-    struct MessageStateViewModel {
-        let title: String
-        let description: String
-        let button: Button?
-
-        struct Button {
-            let title: String
-            let action: () -> Void
-        }
-    }
 }

WordPress/WordPressTest/Domains/SiteDomainsViewModelTests.swift

@@ -183,9 +183,3 @@ extension SiteDomainsViewModel.Section.Row: Equatable {
         return lhs.id == rhs.id && lhs.viewModel == rhs.viewModel
     }
 }
-
-extension SiteDomainsViewModel.MessageStateViewModel: Equatable {
-    public static func == (lhs: SiteDomainsViewModel.MessageStateViewModel, rhs: SiteDomainsViewModel.MessageStateViewModel) -> Bool {
-        return lhs.title == rhs.title && lhs.description == rhs.description
-    }
-}