Revert "dart2js: Don't emit additional precompiled file."

pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dart2js.js_emitter;
 
 
 class OldEmitter implements Emitter {
   final Compiler compiler;
   final CodeEmitterTask task;
@@ skipping 1654 matching lines @@
           compiler.sourceMapUri, compiler.outputUri);
       mainBuffer.add(
           generateSourceMapTag(compiler.sourceMapUri, compiler.outputUri));
       assembledCode = mainBuffer.getText();
     }
 
     compiler.outputProvider('', 'js')
         ..add(assembledCode)
         ..close();
     compiler.assembledCode = assembledCode;
+
+    if (!compiler.useContentSecurityPolicy) {
+      CodeBuffer cspBuffer = new CodeBuffer();
+      cspBuffer.add(mainBuffer);
+      cspBuffer.write("""
+{
+  var message =
+      'Deprecation: Automatic generation of output for Content Security\\n' +
+      'Policy is deprecated and will be removed with the next development\\n' +
+      'release. Use the --csp option to generate CSP restricted output.';
+  if (typeof dartPrint == "function") {
+    dartPrint(message);
+  } else if (typeof console == "object" && typeof console.log == "function") {
+    console.log(message);
+  } else if (typeof print == "function") {
+    print(message);
+  }
+}\n""");
+
+      cspBuffer.write(
+          jsAst.prettyPrint(
+              precompiledFunctionAst, compiler,
+              allowVariableMinification: false).getText());
+
+      compiler.outputProvider('', 'precompiled.js')
+          ..add(cspBuffer.getText())
+          ..close();
+    }
   }
 
   /// Returns a map from OutputUnit to a hash of its content. The hash uniquely
   /// identifies the code of the output-unit. It does not include
   /// boilerplate JS code, like the sourcemap directives or the hash
   /// itself.
   Map<OutputUnit, String> emitDeferredOutputUnits() {
     if (!compiler.deferredLoadTask.isProgramSplit) return const {};
 
     Map<OutputUnit, CodeBuffer> outputBuffers =
@@ skipping 320 matching lines @@
     for (Element element in compiler.enqueuer.codegen.newlyEnqueuedElements) {
       if (element.isInstanceMember) {
         cachedClassBuilders.remove(element.enclosingClass);
 
         nativeEmitter.cachedBuilders.remove(element.enclosingClass);
 
       }
     }
   }
 }