Remove deprecated "SearchableConfigurable.Parent.isVisible()" overrides

Affected configurables are already registered using corresponding
"ConfigurableProvider" instances

platform/vcs-impl/src/com/intellij/openapi/vcs/configurable/VcsManagerConfigurable.java

@@ -74,11 +74,6 @@ public class VcsManagerConfigurable extends SearchableConfigurable.Parent.Abstra
     myMappings.reset();
   }
 
-  @Override
-  public boolean isVisible() {
-    return ProjectLevelVcsManager.getInstance(myProject).getAllVcss().length > 0;
-  }
-
   @Override
   public void disposeUIResources() {
     super.disposeUIResources();

platform/xdebugger-impl/src/com/intellij/xdebugger/impl/settings/DebuggerConfigurable.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2016 JetBrains s.r.o.
+ * Copyright 2000-2017 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -144,11 +144,6 @@ public class DebuggerConfigurable implements SearchableConfigurable.Parent {
     return myRootConfigurable != null;
   }
 
-  @Override
-  public boolean isVisible() {
-    return XBreakpointType.EXTENSION_POINT_NAME.getExtensions().length != 0;
-  }
-
   @Override
   public JComponent createComponent() {
     compute();