Dart SDK Spelling b, c, and d.

pkg/compiler/lib/src/js/placeholder_safety.dart

Index: pkg/compiler/lib/src/js/placeholder_safety.dart
diff --git a/pkg/compiler/lib/src/js/placeholder_safety.dart b/pkg/compiler/lib/src/js/placeholder_safety.dart
index 32571e4694709397b5c5c67fa936d6b67e53c2aa..48b71cc81e13896f96e22b3a31247f50c248b880 100644
--- a/pkg/compiler/lib/src/js/placeholder_safety.dart
+++ b/pkg/compiler/lib/src/js/placeholder_safety.dart
@@ -167,7 +167,7 @@ class PlaceholderSafetyAnalysis extends js.BaseVisitor<int> {
       if (canBeNull(receiver)) safe = false;
       return value;
     }
-    // Be conserative with unrecognized LHS expressions.
+    // Be conservative with unrecognized LHS expressions.
     safe = false;
     return leftToRight();
   }