Apply all blink changes between @202695 and tip of trunk

LayoutTests/dart/inspector/scope-variables.dart

 library scope_variables_test;
 
 import 'dart:core' as core; // import with prefix so global dart:core fields don't appear in scope chain.
 import 'dart:html' as html; // import with prefix so global dart:html fields don't appear in scope chain.
 
 main() {
   html.window.onMessage.listen(handleMessage);
 }
 
 handleMessage(event) {
@@ skipping 22 matching lines @@
     return "[Instance of A, d = $d]";
   }
 }
 
 var globalVariable = 'globalString';
 
 var globalMapVariable = {'foo': 'bar', 'baz': 42};
 
 var globalArrayVariable = [3, 1, 4, 1, 5, 9];
 
-String get throwingGetter {
+core.String get throwingGetter {
   throw 'only the best reviews';
 }
 
 html.DivElement get exampleDivGetter => html.query("#example_div");