Make ~/, round, ceil, floor, truncate return ints. Remove toInt.

tests/corelib/collection_to_string_test.dart

Index: tests/corelib/collection_to_string_test.dart
diff --git a/tests/corelib/collection_to_string_test.dart b/tests/corelib/collection_to_string_test.dart
index 268f58915ba23168be159fb63bbefe9a5caf3e19..070a561e8fe67246ac2b00413465c2fbe2b25f12 100644
--- a/tests/corelib/collection_to_string_test.dart
+++ b/tests/corelib/collection_to_string_test.dart
@@ -78,7 +78,7 @@ void smokeTest() {
 void exactTest() {
   for (int i = 0; i < NUM_TESTS; i++) {
     // Choose a size from 0 to MAX_COLLECTION_SIZE, favoring larger sizes
-    int size = Math.sqrt(random(MAX_COLLECTION_SIZE * MAX_COLLECTION_SIZE)).toInt();
+    int size = Math.sqrt(random(MAX_COLLECTION_SIZE * MAX_COLLECTION_SIZE)).truncate();
 
     StringBuffer stringRep = new StringBuffer();
     Object o = randomCollection(size, stringRep, exact:true);
@@ -100,7 +100,7 @@ void exactTest() {
 void inexactTest() {
   for (int i = 0; i < NUM_TESTS; i++) {
     // Choose a size from 0 to MAX_COLLECTION_SIZE, favoring larger sizes
-    int size = Math.sqrt(random(MAX_COLLECTION_SIZE * MAX_COLLECTION_SIZE)).toInt();
+    int size = Math.sqrt(random(MAX_COLLECTION_SIZE * MAX_COLLECTION_SIZE)).truncate();
 
     StringBuffer stringRep = new StringBuffer();
     Object o = randomCollection(size, stringRep, exact:false);