Remove unused support for requesting token details

Change-Id: I9cc160d84e06b4b7be67e53962fe38c1430e74b2
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/180762
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
Commit-Queue: Brian Wilkerson <brianwilkerson@google.com>

pkg/analysis_server/tool/spec/generated/java/AnalysisServer.java

@@ -411,16 +411,6 @@ public interface AnalysisServer {
    */
   public void completion_getSuggestions(String file, int offset, GetSuggestionsConsumer consumer);
 
-  /**
-   * {@code completion.listTokenDetails}
-   *
-   * Inspect analysis server's knowledge about all of a file's tokens including their lexeme, type,
-   * and what element kinds would have been appropriate for the token's program location.
-   *
-   * @param file The path to the file from which tokens should be returned.
-   */
-  public void completion_listTokenDetails(String file, ListTokenDetailsConsumer consumer);
-
   /**
    * {@code completion.registerLibraryPaths}
    *