issue 4817 fixed. Implemented raw strings with 'r' instead of '@' for dart2js

tests/compiler/dart2js/call_site_type_inferer_test.dart

Index: tests/compiler/dart2js/call_site_type_inferer_test.dart
diff --git a/tests/compiler/dart2js/call_site_type_inferer_test.dart b/tests/compiler/dart2js/call_site_type_inferer_test.dart
index a79801073d1348d2dd23bbfd194c3d87574ec5cc..c202d7691ed944dd6121aacc6c1941db64f93ef1 100644
--- a/tests/compiler/dart2js/call_site_type_inferer_test.dart
+++ b/tests/compiler/dart2js/call_site_type_inferer_test.dart
@@ -22,35 +22,35 @@ void compileAndFind(String code,
   return check(compiler.backend, member);
 }
 
-const String TEST_1 = @"""
+const String TEST_1 = r"""
   class A {
     x(p) => p;
   }
   main() { new A().x("s"); }
 """;
 
-const String TEST_2 = @"""
+const String TEST_2 = r"""
   class A {
     x(p) => p;
   }
   main() { new A().x(1); }
 """;
 
-const String TEST_3 = @"""
+const String TEST_3 = r"""
   class A {
     x(p) => x(p - 1);
   }
   main() { new A().x(1); }
 """;
 
-const String TEST_4 = @"""
+const String TEST_4 = r"""
   class A {
     x(p) => x(p - 1);
   }
   main() { new A().x(1.0); }
 """;
 
-const String TEST_5 = @"""
+const String TEST_5 = r"""
   class A {
     x(p) => p;
   }
@@ -60,7 +60,7 @@ const String TEST_5 = @"""
   }
 """;
 
-const String TEST_6 = @"""
+const String TEST_6 = r"""
   class A {
     x(p) => p;
   }
@@ -70,7 +70,7 @@ const String TEST_6 = @"""
   }
 """;
 
-const String TEST_7 = @"""
+const String TEST_7 = r"""
   class A {
     x(p) => x("x");
   }
@@ -79,7 +79,7 @@ const String TEST_7 = @"""
   }
 """;
 
-const String TEST_8 = @"""
+const String TEST_8 = r"""
   class A {
     x(p1, p2) => x(p1, "x");
   }
@@ -88,7 +88,7 @@ const String TEST_8 = @"""
   }
 """;
 
-const String TEST_9 = @"""
+const String TEST_9 = r"""
   class A {
     x(p1, p2) => x(p1, p2);
   }
@@ -97,7 +97,7 @@ const String TEST_9 = @"""
   }
 """;
 
-const String TEST_10 = @"""
+const String TEST_10 = r"""
   class A {
     x(p1, p2) => x(p1, p2);
   }
@@ -110,7 +110,7 @@ const String TEST_10 = @"""
   }
 """;
 
-const String TEST_11 = @"""
+const String TEST_11 = r"""
   class A {
     x(p1, p2) => x(1, 2);
   }
@@ -119,7 +119,7 @@ const String TEST_11 = @"""
   }
 """;
 
-const String TEST_12 = @"""
+const String TEST_12 = r"""
   class A {
     x(p1, [p2 = 1]) => 1;
   }
@@ -129,7 +129,7 @@ const String TEST_12 = @"""
   }
 """;
 
-const String TEST_13 = @"""
+const String TEST_13 = r"""
   class A {
     x(p) => 1;
   }