cleans up sdk patching so we no longer have unresolved names

test/codegen/expect/_js_primitives/_js_primitives.js

+var _js_primitives;
+(function(_js_primitives) {
+  'use strict';
+  // Function printString: (String) → void
+  function printString(string) {
+    if (_foreign_helper.JS('bool', 'typeof dartPrint == "function"')) {
+      _foreign_helper.JS('void', 'dartPrint(#)', string);
+      return;
+    }
+    if (dart.dbinary(_foreign_helper.JS('bool', 'typeof console == "object"'), '&&', _foreign_helper.JS('bool', 'typeof console.log != "undefined"'))) {
+      _foreign_helper.JS('void', 'console.log(#)', string);
+      return;
+    }
+    if (_foreign_helper.JS('bool', 'typeof window == "object"')) {
+      return;
+    }
+    if (_foreign_helper.JS('bool', 'typeof print == "function"')) {
+      _foreign_helper.JS('void', 'print(#)', string);
+      return;
+    }
+    _foreign_helper.JS('void', 'throw "Unable to print message: " + String(#)', string);
+  }
+  // Exports:
+  _js_primitives.printString = printString;
+})(_js_primitives || (_js_primitives = {}));