Remove unnecessary fields

src/server/editorServices.ts

@@ -2298,7 +2298,6 @@ namespace ts.server {
             }
             else if (mapFileNameFromDeclarationInfo) {
                 declarationInfo.sourceMapFilePath = {
-                    declarationInfoPath: declarationInfo.path,
                     watcher: this.addMissingSourceMapFile(
                         project.currentDirectory === this.currentDirectory ?
                             mapFileNameFromDeclarationInfo :

src/server/scriptInfo.ts

@@ -283,7 +283,6 @@ namespace ts.server {
 
     /*@internal*/
     export interface SourceMapFileWatcher {
-        declarationInfoPath: Path;
         watcher: FileWatcher;
         sourceInfos?: Map<true>;
     }