Deprecate execution.setSubscriptions.

BUG=
R=brianwilkerson@google.com, scheglov@google.com

Review-Url: https://codereview.chromium.org/2713513007 .

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

@@ -378,7 +378,7 @@ public interface AnalysisServer {
    *         validated and no change be generated.
    * @param options Data used to provide values provided by the user. The structure of the data is
    *         dependent on the kind of refactoring being performed. The data that is expected is
-   *         documented in the section titled Refactorings, labeled as “Options”. This field can be
+   *         documented in the section titled Refactorings, labeled as "Options". This field can be
    *         omitted if the refactoring does not require any options or if the values of those
    *         options are not known.
    */
@@ -467,6 +467,8 @@ public interface AnalysisServer {
   /**
    * {@code execution.setSubscriptions}
    *
+   * Deprecated: the analysis server no longer fires LAUNCH_DATA events.
+   *
    * Subscribe for services. All previous subscriptions are replaced by the given set of services.
    *
    * It is an error if any of the elements in the list are not valid services. If there is an error,