dart2js: Fix minor indentation issues.

pkg/compiler/lib/src/source_file_provider.dart

Index: pkg/compiler/lib/src/source_file_provider.dart
diff --git a/pkg/compiler/lib/src/source_file_provider.dart b/pkg/compiler/lib/src/source_file_provider.dart
index 6c02b3a6ca85c1add796e78e6e5bca89d886986b..b47fc647a272a54a9b51db50b0584ce9376c7b11 100644
--- a/pkg/compiler/lib/src/source_file_provider.dart
+++ b/pkg/compiler/lib/src/source_file_provider.dart
@@ -176,7 +176,7 @@ class FormattingDiagnosticHandler {
     // [lastKind] records the previous non-INFO kind we saw.
     // This is used to suppress info about a warning when warnings are
     // suppressed, and similar for hints.
-     if (kind != api.Diagnostic.INFO) {
+    if (kind != api.Diagnostic.INFO) {
       lastKind = kind;
     }
     var color;