Deprecate automatic generation of precompiled.js.

tools/testing/dart/compiler_configuration.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.
 
 library compiler_configuration;
 
 import 'dart:io' show
     Platform;
 
 import 'runtime_configuration.dart' show
@@ skipping 230 matching lines @@
     if (isHostChecked) multiplier *= 16;
     return multiplier;
   }
 
   CommandArtifact computeCompilationArtifact(
       String buildDir,
       String tempDir,
       CommandBuilder commandBuilder,
       List arguments,
       Map<String, String> environmentOverrides) {
-    String normalOutput = '$tempDir/out.js';
-    String cspOutput = '$tempDir/out.precompiled.js';
     return new CommandArtifact(
         <Command>[
             this.computeCompilationCommand(
-                normalOutput,
+                '$tempDir/out.js',
                 buildDir,
                 CommandBuilder.instance,
                 arguments,
                 environmentOverrides)],
-        // dart2js always produce both out.js and out.precompiled.js. To avoid
-        // recompiling the CSP version, we always tell the CompilationCommand
-        // to track the timestamp of out.js, but select which one to run based
-        // on CSP mode.
-        isCsp ? cspOutput : normalOutput,
+        '$tempDir/out.js',
         'application/javascript');
   }
 
   List<String> computeRuntimeArguments(
       RuntimeConfiguration runtimeConfiguration,
       String buildDir,
       TestInformation info,
       List<String> vmOptions,
       List<String> sharedOptions,
       List<String> originalArguments,
@@ skipping 113 matching lines @@
       bool isDebug,
       bool isChecked,
       bool isHostChecked,
       bool useSdk})
       : super(
           'dart2analyzer', isDebug: isDebug, isChecked: isChecked,
           isHostChecked: isHostChecked, useSdk: useSdk);
 
   String computeCompilerPath(String buildDir) => 'editor/tools/analyzer';
 }