Import math library with a prefix.

utils/tests/pub/command_line_config.dart

Index: utils/tests/pub/command_line_config.dart
diff --git a/utils/tests/pub/command_line_config.dart b/utils/tests/pub/command_line_config.dart
index 1efd7d1d2b3450a41fdf883ddf6fa59d96cd80c4..2fbc3cd4a068c95156ced36be1c80bc4be47a776 100644
--- a/utils/tests/pub/command_line_config.dart
+++ b/utils/tests/pub/command_line_config.dart
@@ -5,7 +5,7 @@
 library command_line_config;
 
 import 'dart:io';
-import 'dart:math';
+import 'dart:math' as math;
 
 import 'package:pathos/path.dart' as path;
 import 'package:unittest/unittest.dart';
@@ -92,7 +92,7 @@ class CommandLineConfiguration extends Configuration {
     if (stack.length == 0) return;
 
     // Figure out the longest path so we know how much to pad.
-    int longest = stack.map((frame) => frame.location.length).reduce(max);
+    int longest = stack.map((frame) => frame.location.length).reduce(math.max);
 
     // Print out the stack trace nicely formatted.
     for (var frame in stack) {