Remove unused methods (#9504)

Noticed this in my other PR

Author: davidwengier

src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/ProjectSystem/DefaultProjectSnapshotManager.cs

@@ -282,35 +282,6 @@ internal override void ProjectAdded(HostProject hostProject)
         }
     }
 
-    internal override IProjectSnapshot GetOrAddLoadedProject(ProjectKey projectKey, Func<HostProject> createHostProjectFunc)
-    {
-        IProjectSnapshot? newProjectSnapshot = null;
-        using (var upgradeableReadLock = _rwLocker.EnterUpgradeAbleReadLock())
-        {
-            var project = GetLoadedProject(projectKey);
-
-            if (project is not null)
-            {
-                return project;
-            }
-
-            var newProject = createHostProjectFunc();
-            var state = ProjectState.Create(Workspace.Services, newProject);
-            var entry = new Entry(state);
-
-            using (upgradeableReadLock.EnterWriteLock())
-            {
-                _projects_needsLock[projectKey] = entry;
-            }
-
-            newProjectSnapshot = _projects_needsLock[projectKey].GetSnapshot();
-        }
-
-        // New project was created, notify outside of the lock
-        NotifyListeners(older: null, newProjectSnapshot, documentFilePath: null, ProjectChangeKind.ProjectAdded);
-        return newProjectSnapshot;
-    }
-
     internal override void ProjectConfigurationChanged(HostProject hostProject)
     {
         if (hostProject is null)
@@ -360,22 +331,6 @@ internal override void ProjectRemoved(ProjectKey projectKey)
         }
     }
 
-    internal override bool TryRemoveLoadedProject(ProjectKey projectKey, [NotNullWhen(true)] out IProjectSnapshot? project)
-    {
-        if (TryChangeEntry_UsesLock(
-            projectKey,
-            documentFilePath: null,
-            new ProjectRemovedAction(projectKey),
-            out var oldSnapshot,
-            out project))
-        {
-            NotifyListeners(oldSnapshot, project, documentFilePath: null, ProjectChangeKind.ProjectRemoved);
-            return true;
-        }
-
-        return false;
-    }
-
     internal override void SolutionOpened()
     {
         IsSolutionClosing = false;

src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/ProjectSystem/ProjectSnapshotManagerBase.cs

@@ -3,7 +3,6 @@
 
 using System;
 using System.Collections.Immutable;
-using System.Diagnostics.CodeAnalysis;
 using Microsoft.AspNetCore.Razor.ProjectSystem;
 using Microsoft.CodeAnalysis.Text;
 
@@ -46,11 +45,4 @@ internal abstract class ProjectSnapshotManagerBase : ProjectSnapshotManager
     internal abstract void SolutionOpened();
 
     internal abstract void SolutionClosed();
-
-    /// <summary>
-    /// Gets a project if it's already loaded, or calls <see cref="ProjectAdded(HostProject)" /> with a new host project
-    /// </summary>
-    internal abstract IProjectSnapshot GetOrAddLoadedProject(ProjectKey projectKey, Func<HostProject> createHostProjectFunc);
-
-    internal abstract bool TryRemoveLoadedProject(ProjectKey projectKey, [NotNullWhen(true)] out IProjectSnapshot? project);
 }