bazel syntax: remove temporary alias to renamed function

...provided for copybara, to which we cannot commit atomically.

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PiperOrigin-RevId: 268764305
diff --git a/src/main/java/com/google/devtools/build/lib/syntax/BuildFileAST.java b/src/main/java/com/google/devtools/build/lib/syntax/BuildFileAST.java
index 7923c51..4e07b7c 100644
--- a/src/main/java/com/google/devtools/build/lib/syntax/BuildFileAST.java
+++ b/src/main/java/com/google/devtools/build/lib/syntax/BuildFileAST.java
@@ -370,15 +370,6 @@
   }
 
   /**
-   * Temporary alias for parseWithoutImports, as, maddeningly, we cannot atomically change our API
-   * and copybara's use of it. TODO(adonovan): delete once copybara is updated, Sep 2019.
-   */
-  public static BuildFileAST parseSkylarkFileWithoutImports(
-      ParserInputSource input, EventHandler handler) {
-    return parseWithoutImports(input, handler);
-  }
-
-  /**
    * Run static checks on the syntax tree.
    *
    * @return a new syntax tree (or the same), with the containsErrors flag updated.