Revert r16155: unit tests of the dart2js compiler fail.

sdk/lib/_internal/compiler/implementation/ssa/builder.dart

Index: sdk/lib/_internal/compiler/implementation/ssa/builder.dart
===================================================================
--- sdk/lib/_internal/compiler/implementation/ssa/builder.dart	(revision 16155)
+++ sdk/lib/_internal/compiler/implementation/ssa/builder.dart	(working copy)
@@ -3111,29 +3111,6 @@
                       inputs));
   }
 
-  void handleForeignSetCurrentIsolate(Send node) {
-    if (node.arguments.isEmpty || !node.arguments.tail.isEmpty) {
-      compiler.cancel('Exactly one argument required',
-                      node: node.argumentsNode);
-    }
-    visit(node.arguments.head);
-    String isolateName = backend.namer.CURRENT_ISOLATE;
-    push(new HForeign(new DartString.literal("$isolateName = #"),
-                      const LiteralDartString('void'),
-                      <HInstruction>[pop()]));
-  }
-
-  void handleForeignCreateIsolate(Send node) {
-    if (!node.arguments.isEmpty) {
-      compiler.cancel('Too many arguments',
-                      node: node.argumentsNode);
-    }
-    String constructorName = backend.namer.isolateName;
-    push(new HForeign(new DartString.literal("new $constructorName"),
-                      const LiteralDartString('var'),
-                      <HInstruction>[]));
-  }
-
   visitForeignSend(Send node) {
     Selector selector = elements.getSelector(node);
     SourceString name = selector.name;
@@ -3149,10 +3126,6 @@
       handleForeignJsCallInIsolate(node);
     } else if (name == const SourceString('DART_CLOSURE_TO_JS')) {
       handleForeignDartClosureToJs(node);
-    } else if (name == const SourceString('JS_SET_CURRENT_ISOLATE')) {
-      handleForeignSetCurrentIsolate(node);
-    } else if (name == const SourceString('JS_CREATE_ISOLATE')) {
-      handleForeignCreateIsolate(node);
     } else {
       throw "Unknown foreign: ${selector}";
     }