Make more workspace tests async.

src/EditorFeatures/Test/SolutionCrawler/WorkCoordinatorTests.cs

@@ -771,7 +771,7 @@ public async Task ProgressReporterTest()
 
         private async Task InsertText(string code, string text, bool expectDocumentAnalysis, string language = LanguageNames.CSharp)
         {
-            using (var workspace = TestWorkspaceFactory.CreateWorkspaceFromLines(
+            using (var workspace = await TestWorkspaceFactory.CreateWorkspaceFromLinesAsync(
                 SolutionCrawler, language, compilationOptions: null, parseOptions: null, content: new string[] { code }))
             {
                 var analyzer = new Analyzer();

src/EditorFeatures/Test/Workspaces/TestWorkspaceFactory.cs

@@ -67,16 +67,6 @@ public partial class TestWorkspaceFactory
             return CreateWorkspaceFromFilesAsync(language, compilationOptions, parseOptions, total);
         }
 
-        internal static TestWorkspace CreateWorkspaceFromLines(
-            string workspaceKind,
-            string language,
-            CompilationOptions compilationOptions,
-            ParseOptions parseOptions,
-            params string[] content)
-        {
-            return CreateWorkspaceFromLinesAsync(workspaceKind, language, compilationOptions, parseOptions, content).WaitAndGetResult(CancellationToken.None);
-        }
-
         /// <summary>
         /// Creates a single buffer in a workspace.
         /// </summary>