Revert "dart2js: switching isolate is not 'PURE'"

pkg/compiler/lib/src/native/behavior.dart

Index: pkg/compiler/lib/src/native/behavior.dart
diff --git a/pkg/compiler/lib/src/native/behavior.dart b/pkg/compiler/lib/src/native/behavior.dart
index 08f1dd9fdf0528799ecf0beef0771be2a6c78773..438dbe6d1797ecdcef10d0ae306075f3c9bfdcab 100644
--- a/pkg/compiler/lib/src/native/behavior.dart
+++ b/pkg/compiler/lib/src/native/behavior.dart
@@ -111,9 +111,6 @@ class NativeBehavior {
   static NativeBehavior get PURE => NativeBehavior._makePure();
   static NativeBehavior get PURE_ALLOCATION =>
       NativeBehavior._makePure(isAllocation: true);
-  static NativeBehavior get CHANGES_OTHER => NativeBehavior._makeChangesOther();
-  static NativeBehavior get DEPENDS_OTHER => NativeBehavior._makeDependsOther();
-
 
   String toString() {
     return 'NativeBehavior('
@@ -135,18 +132,6 @@ class NativeBehavior {
     return behavior;
   }
 
-  static NativeBehavior _makeChangesOther() {
-    // TODO(25544): Have a distinct effect instead of using static properties to
-    // model 'other' effects.
-    return _makePure()..behavior.sideEffects.setChangesStaticProperty();
-  }
-
-  static NativeBehavior _makeDependsOther() {
-    // TODO(25544): Have a distinct effect instead of using static properties to
-    // model 'other' effects.
-    return _makePure()..behavior.sideEffects.setDependsStaticProperty();
-  }
-
   /// Processes the type specification string of a call to JS and stores the
   /// result in the [typesReturned] and [typesInstantiated]. It furthermore
   /// computes the side effects, and, if given, invokes [setSideEffects] with