Convert raw strings in compiler

lib/compiler/implementation/lib/math_patch.dart

Index: lib/compiler/implementation/lib/math_patch.dart
===================================================================
--- lib/compiler/implementation/lib/math_patch.dart	(revision 12782)
+++ lib/compiler/implementation/lib/math_patch.dart	(working copy)
@@ -8,39 +8,39 @@
 #import("js_helper.dart");
 
 patch double sqrt(num x)
-  => JS('double', @'Math.sqrt(#)', checkNum(x));
+  => JS('double', r'Math.sqrt(#)', checkNum(x));
 
 patch double sin(num x)
-  => JS('double', @'Math.sin(#)', checkNum(x));
+  => JS('double', r'Math.sin(#)', checkNum(x));
 
 patch double cos(num x)
-  => JS('double', @'Math.cos(#)', checkNum(x));
+  => JS('double', r'Math.cos(#)', checkNum(x));
 
 patch double tan(num x)
-  => JS('double', @'Math.tan(#)', checkNum(x));
+  => JS('double', r'Math.tan(#)', checkNum(x));
 
 patch double acos(num x)
-  => JS('double', @'Math.acos(#)', checkNum(x));
+  => JS('double', r'Math.acos(#)', checkNum(x));
 
 patch double asin(num x)
-  => JS('double', @'Math.asin(#)', checkNum(x));
+  => JS('double', r'Math.asin(#)', checkNum(x));
 
 patch double atan(num x)
-  => JS('double', @'Math.atan(#)', checkNum(x));
+  => JS('double', r'Math.atan(#)', checkNum(x));
 
 patch double atan2(num a, num b)
-  => JS('double', @'Math.atan2(#, #)', checkNum(a), checkNum(b));
+  => JS('double', r'Math.atan2(#, #)', checkNum(a), checkNum(b));
 
 patch double exp(num x)
-  => JS('double', @'Math.exp(#)', checkNum(x));
+  => JS('double', r'Math.exp(#)', checkNum(x));
 
 patch double log(num x)
-  => JS('double', @'Math.log(#)', checkNum(x));
+  => JS('double', r'Math.log(#)', checkNum(x));
 
 patch num pow(num x, num exponent) {
   checkNum(x);
   checkNum(exponent);
-  return JS('num', @'Math.pow(#, #)', x, exponent);
+  return JS('num', r'Math.pow(#, #)', x, exponent);
 }
 
 patch class Random {