Spelling fixes e to i.

pkg/front_end/test/fasta/parser/token_stream_rewriter_test.dart

Index: pkg/front_end/test/fasta/parser/token_stream_rewriter_test.dart
diff --git a/pkg/front_end/test/fasta/parser/token_stream_rewriter_test.dart b/pkg/front_end/test/fasta/parser/token_stream_rewriter_test.dart
index e7d4a670ab5d9aa3454f04b7c02be96bea7c6976..9aa7fe2c253a11c24d99b0a82f911aa0c35c72a9 100644
--- a/pkg/front_end/test/fasta/parser/token_stream_rewriter_test.dart
+++ b/pkg/front_end/test/fasta/parser/token_stream_rewriter_test.dart
@@ -133,7 +133,7 @@ abstract class TokenStreamRewriterTest {
 /// Concrete implementation of [TokenStreamRewriterTest] in which
 /// [Token.previous] values are set to null.
 ///
-/// This forces [TokenStreamRewriter] to use its more complex heursitc for
+/// This forces [TokenStreamRewriter] to use its more complex heuristic for
 /// finding previous tokens.
 @reflectiveTest
 class TokenStreamRewriterTest_NoPrevious extends TokenStreamRewriterTest {