Remove duplicate methods from TemplateCompilerNode

These methods match the super classes implementation. This removes the
duplication.

packages/core/src/template-compiler-node.ts

@@ -51,35 +51,4 @@ export class NodeTemplateCompiler extends TemplateCompiler {
       } as InlineBabelParams,
     ];
   }
-
-  baseDir() {
-    return join(__dirname, '..');
-  }
-
-  // tests for the classic ember-cli-htmlbars-inline-precompile babel plugin
-  static isInlinePrecompilePlugin(item: PluginItem) {
-    if (typeof item === 'string') {
-      return matchesSourceFile(item);
-    }
-    if (hasProperties(item) && (item as any)._parallelBabel) {
-      return matchesSourceFile((item as any)._parallelBabel.requireFile);
-    }
-    if (Array.isArray(item) && item.length > 0) {
-      if (typeof item[0] === 'string') {
-        return matchesSourceFile(item[0]);
-      }
-      if (hasProperties(item[0]) && (item[0] as any)._parallelBabel) {
-        return matchesSourceFile((item[0] as any)._parallelBabel.requireFile);
-      }
-    }
-    return false;
-  }
-}
-
-function matchesSourceFile(filename: string) {
-  return /(htmlbars-inline-precompile|ember-cli-htmlbars)\/(index|lib\/require-from-worker)(\.js)?$/.test(filename);
-}
-
-function hasProperties(item: any) {
-  return item && (typeof item === 'object' || typeof item === 'function');
 }