Convert raw strings in compiler

lib/compiler/implementation/js_backend/emitter.dart

 // Copyright (c) 2012, 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.
 
 /**
  * A function element that represents a closure call. The signature is copied
  * from the given element.
  */
 class ClosureInvocationElement extends FunctionElement {
   ClosureInvocationElement(SourceString name,
@@ skipping 1074 matching lines @@
         emitMakeConstantList(buffer);
       }
       buffer.add('$isolateProperties.$name = ');
       writeConstantToBuffer(constant, buffer, emitCanonicalVersion: false);
       buffer.add(';\n');
     }
   }
 
   void emitMakeConstantList(CodeBuffer buffer) {
     buffer.add(namer.ISOLATE);
-    buffer.add(@'''.makeConstantList = function(list) {
+    buffer.add(r'''.makeConstantList = function(list) {
   list.immutable$list = true;
   list.fixed$length = true;
   return list;
 };
 ''');
   }
 
   /**
    * Documentation wanted -- johnniwinther
    *
@@ skipping 249 matching lines @@
 
 """);
   }
 
   String assembleProgram() {
     measure(() {
       mainBuffer.add(HOOKS_API_USAGE);
       mainBuffer.add('function ${namer.ISOLATE}() {}\n');
       mainBuffer.add('init();\n\n');
       // Shorten the code by using "$$" as temporary.
-      classesCollector = @"$$";
+      classesCollector = r"$$";
       mainBuffer.add('var $classesCollector = {};\n');
       // Shorten the code by using [namer.CURRENT_ISOLATE] as temporary.
       isolateProperties = namer.CURRENT_ISOLATE;
       mainBuffer.add('var $isolateProperties = $isolatePropertiesName;\n');
       emitClasses(mainBuffer);
       mainBuffer.add(boundClosureBuffer);
       // Clear the buffer, so that we can reuse it for the native classes.
       boundClosureBuffer.clear();
       emitStaticFunctions(mainBuffer);
       emitStaticFunctionGetters(mainBuffer);
@@ skipping 58 matching lines @@
 const String HOOKS_API_USAGE = """
 // Generated by dart2js, the Dart to JavaScript compiler.
 // The code supports the following hooks:
 // dartPrint(message)   - if this function is defined it is called
 //                        instead of the Dart [print] method.
 // dartMainRunner(main) - if this function is defined, the Dart [main]
 //                        method will not be invoked directly.
 //                        Instead, a closure that will invoke [main] is
 //                        passed to [dartMainRunner].
 """;