Spelling fixes e to i.

tools/dom/src/KeyboardEventStream.dart

Index: tools/dom/src/KeyboardEventStream.dart
diff --git a/tools/dom/src/KeyboardEventStream.dart b/tools/dom/src/KeyboardEventStream.dart
index 7b9b13eda75bb55095e908ed3c7632991e8cc7b6..fea4654ad03c4c85849c499bdc26913a21d1535d 100644
--- a/tools/dom/src/KeyboardEventStream.dart
+++ b/tools/dom/src/KeyboardEventStream.dart
@@ -328,7 +328,7 @@ class _KeyboardEventHandler extends EventStreamProvider<KeyEvent> {
       // Opera reports the character code in the keyCode field.
       e._shadowCharCode = KeyCode.isCharacterKey(e.keyCode) ? e.keyCode : 0;
     }
-    // Now we guestimate about what the keycode is that was actually
+    // Now we guesstimate about what the keycode is that was actually
     // pressed, given previous keydown information.
     e._shadowKeyCode = _determineKeyCodeForKeypress(e);