All strong mode cleaning of dart2js.

pkg/compiler/tool/track_memory.dart

 // Copyright (c) 2015, 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.
 
 /// A script to track the high water-mark of memory usage of an application.
 /// To monitor how much memory dart2js is using, run dart2js as follows:
 ///
 ///     DART_VM_OPTIONS=--observe dart2js ...
 ///
 /// and run this script immediately after.
@@ skipping 133 matching lines @@
   sb.write(' | ');
   _writeNumber(sb, lastOldUsed, oldUsed);
   _writeNumber(sb, lastOldCapacity, oldCapacity, color: true);
 
   sb.write(' | ');
   _writeNumber(sb, lastNewUsed + lastOldUsed, newUsed + oldUsed);
   _writeNumber(sb, lastNewCapacity + lastOldCapacity, newCapacity + oldCapacity,
       color: true);
 
   sb.write(' | ');
-  var maxUsed = max(lastMaxUsed, newUsed + oldUsed);
-  var maxCapacity = max(lastMaxCapacity, newCapacity + oldCapacity);
+  int maxUsed = max(lastMaxUsed, newUsed + oldUsed);
+  int maxCapacity = max(lastMaxCapacity, newCapacity + oldCapacity);
   _writeNumber(sb, lastMaxUsed, maxUsed);
   _writeNumber(sb, lastMaxCapacity, maxCapacity, color: true);
   stdout.write('$sb');
 
   lastNewUsed = newUsed;
   lastOldUsed = oldUsed;
   lastMaxUsed = maxUsed;
   lastNewCapacity = newCapacity;
   lastOldCapacity = oldCapacity;
   lastMaxCapacity = maxCapacity;
@@ skipping 19 matching lines @@
 _printHeader() {
   print('''
 Memory usage:
  new generation   | old generation   | total            | max
   in-use/capacity |  in-use/capacity |  in-use/capacity |  in-use/capacity ''');
 }
 
 const _RED = '\x1b[31m';
 const _GREEN = '\x1b[32m';
 const _NONE = '\x1b[0m';