Removing ISyntaxFactsService.IsStatement, changing its only use in...

Removing ISyntaxFactsService.IsStatement, changing its only use in GetExpressionSemanticBoundary to IsExecutableStatement

src/Workspaces/CSharp/Portable/LanguageServices/CSharpSyntaxFactsService.cs

@@ -265,9 +265,6 @@ public bool IsUsingStatement(SyntaxNode node)
         public bool IsReturnStatement(SyntaxNode node)
             => node.Kind() == SyntaxKind.ReturnStatement;
 
-        public bool IsStatement(SyntaxNode node)
-            => node is StatementSyntax;
-
         public bool IsExecutableStatement(SyntaxNode node)
             => node is StatementSyntax;
 

src/Workspaces/Core/Portable/LanguageServices/SyntaxFactsService/ISyntaxFactsService.cs

@@ -254,7 +254,6 @@ internal interface ISyntaxFactsService : ILanguageService
         bool IsForEachStatement(SyntaxNode node);
         bool IsLockStatement(SyntaxNode node);
         bool IsUsingStatement(SyntaxNode node);
-        bool IsStatement(SyntaxNode node);
         bool IsExecutableStatement(SyntaxNode node);
         bool IsParameter(SyntaxNode node);
         bool IsVariableDeclarator(SyntaxNode node);

src/Workspaces/Core/Portable/Shared/Extensions/SyntaxEditorExtensions.cs

@@ -122,7 +122,7 @@ private static SyntaxNode GetExpressionSemanticBoundary(ISyntaxFactsService synt
             //    in the document, all will be verified.
             // 2. Cannot include ArgumentSyntax because it could affect generic argument inference.
             return node.FirstAncestorOrSelf<SyntaxNode>(
-                n => syntaxFacts.IsStatement(n) ||
+                n => syntaxFacts.IsExecutableStatement(n) ||
                      syntaxFacts.IsParameter(n) ||
                      syntaxFacts.IsVariableDeclarator(n) ||
                      n.Parent == null);

src/Workspaces/VisualBasic/Portable/LanguageServices/VisualBasicSyntaxFactsService.vb

@@ -270,10 +270,6 @@ Namespace Microsoft.CodeAnalysis.VisualBasic
             Return node.Kind() = SyntaxKind.ReturnStatement
         End Function
 
-        Public Function IsStatement(node As SyntaxNode) As Boolean Implements ISyntaxFactsService.IsStatement
-            Return TypeOf node Is StatementSyntax
-        End Function
-
         Public Function IsExecutableStatement(node As SyntaxNode) As Boolean Implements ISyntaxFactsService.IsExecutableStatement
             Return TypeOf node Is ExecutableStatementSyntax
         End Function