Remove methods on StackTrace class.

runtime/tests/vm/dart/optimized_stacktrace_test.dart

 // Copyright (c) 2013, 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 correct source positions in stack trace with optimized functions.
 import "package:expect/expect.dart";
 
-// (1) Test normal exception. 
+// (1) Test normal exception.
 foo(x) => bar(x);
 
 bar(x) {
   if (x == null) throw 42;  // throw at position 11:18
   return x + 1;
 }
 
 test1() {
   // First unoptimized.
   try {
     foo(null);
     Expect.fail("Unreachable");
   } catch (e, stacktrace) {
     String s = stacktrace.toString();
-    Expect.equals(-1, s.indexOf("-1:-1"));
-    Expect.notEquals(-1, s.indexOf("11:18"));
+    Expect.isFalse(s.contains("-1:-1"));
+    Expect.isTrue(s.contains("11:18"));
   }
 
   // Optimized.
   for (var i=0; i<10000; i++) foo(42);
   try {
     foo(null);
     Expect.fail("Unreachable");
   } catch (e, stacktrace) {
     String s = stacktrace.toString();
-    Expect.equals(-1, s.indexOf("-1:-1"));
-    Expect.notEquals(-1, s.indexOf("11:18"));
+    Expect.isFalse(s.contains("-1:-1"));
+    Expect.isTrue(s.contains("11:18"));
   }
 }
 
 
 // (2) Test checked mode exceptions.
 maximus(x) => moritz(x);
 
 moritz(x) {
   if (x == 333)  return 42 ? 0 : 1;  // Throws in checked mode.
   if (x == 777)   {
     bool b = x;  // Throws in checked mode.
     return b;
   }
 
   return x + 1;
 }
 
 test2() {
   for (var i=0; i<100000; i++) maximus(42);
   try {
     maximus(333);
   } catch (e, stacktrace) {
     String s = stacktrace.toString();
     print(s);
-    Expect.notEquals(-1, s.indexOf("maximus"));
-    Expect.notEquals(-1, s.indexOf("moritz"));
-    Expect.equals(-1, s.indexOf("-1:-1"));
+    Expect.isTrue(s.contains("maximus"));
+    Expect.isTrue(s.contains("moritz"));
+    Expect.isFalse(s.contains("-1:-1"));
   }
 
   try {
     maximus(777);
   } catch (e, stacktrace) {
     String s = stacktrace.toString();
     print(s);
-    Expect.notEquals(-1, s.indexOf("maximus"));
-    Expect.notEquals(-1, s.indexOf("moritz"));
-    Expect.equals(-1, s.indexOf("-1:-1"));
+    Expect.isTrue(s.contains("maximus"));
+    Expect.isTrue(s.contains("moritz"));
+    Expect.isFalse(s.contains("-1:-1"));
   }
 }
 
 main() {
   test1();
   test2();
 }