Strong mode cleaning of many dart2js tests.

tests/compiler/dart2js/deferred_inline_restrictions_test.dart

 // Copyright (c) 2014, 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.
 
 // Test that we do not accidentally leak code from deferred libraries but do
 // allow inlining of empty functions and from main.
 
 import 'package:async_helper/async_helper.dart';
 import 'package:compiler/compiler_new.dart';
 import 'package:compiler/src/compiler.dart';
 import 'package:expect/expect.dart';
 import 'memory_compiler.dart';
 
 void main() {
   asyncTest(() async {
     OutputCollector collector = new OutputCollector();
     CompilationResult result = await runCompiler(
         memorySourceFiles: MEMORY_SOURCE_FILES, outputProvider: collector);
     Compiler compiler = result.compiler;
 
     lookupLibrary(name) {
       return compiler.libraryLoader.lookupLibrary(Uri.parse(name));
     }
 
     var outputUnitForElement = compiler.deferredLoadTask.outputUnitForElement;
 
-    var lib1 = lookupLibrary("memory:lib1.dart");
+    dynamic lib1 = lookupLibrary("memory:lib1.dart");
     var inlineMeAway = lib1.find("inlineMeAway");
     var ou_lib1 = outputUnitForElement(inlineMeAway);
 
-    var lib3 = lookupLibrary("memory:lib3.dart");
+    dynamic lib3 = lookupLibrary("memory:lib3.dart");
     var sameContextInline = lib3.find("sameContextInline");
     var ou_lib3 = outputUnitForElement(sameContextInline);
 
     // Test that we actually got different output units.
     Expect.notEquals(ou_lib1.name, ou_lib3.name);
 
     String mainOutput = collector.getOutput("", OutputType.js);
     String lib1Output =
         collector.getOutput("out_${ou_lib1.name}", OutputType.jsPart);
     String lib3Output =
@@ skipping 60 matching lines @@
 import "lib3.dart" as lib3;
 
 test() {
   print(lib3.sameContextInline("should be inlined"));
 }
 """,
   "lib3.dart": """
 sameContextInline(x) => "inline same context" + x;
 """
 };