extract current migration tracking out of JavaPsiFacade to a separate PsiMigrationManager; reduce amount of unnecessary Project->PsiManager->Project shuffling

java/java-psi-api/src/com/intellij/psi/JavaPsiFacade.java

@@ -111,15 +111,6 @@ public abstract class JavaPsiFacade {
   @NotNull
   public abstract PsiResolveHelper getResolveHelper();
 
-  /**
-   * Initiates a migrate refactoring. The refactoring is finished when
-   * {@link com.intellij.psi.PsiMigration#finish()} is called.
-   *
-   * @return the migrate operation object.
-   */
-  @NotNull
-  public abstract PsiMigration startMigration();
-
   /**
    * Returns the name helper for the project, which can be used to validate
    * and parse Java identifiers.