Update .iml files.

pkg/front_end/front_end.iml

Index: pkg/front_end/front_end.iml
diff --git a/pkg/front_end/front_end.iml b/pkg/front_end/front_end.iml
index 8b2c80fb1bdfbb9a3a151da164bfed5b8b76b938..7f7c017ac92a8527e5576994421df6160b1c5450 100644
--- a/pkg/front_end/front_end.iml
+++ b/pkg/front_end/front_end.iml
@@ -2,7 +2,20 @@
 <module type="WEB_MODULE" version="4">
   <component name="NewModuleRootManager" inherit-compiler-output="true">
     <exclude-output />
-    <content url="file://$MODULE_DIR$" />
+    <content url="file://$MODULE_DIR$">
+      <excludeFolder url="file://$MODULE_DIR$/.pub" />
+      <excludeFolder url="file://$MODULE_DIR$/build" />
+      <excludeFolder url="file://$MODULE_DIR$/packages" />
+      <excludeFolder url="file://$MODULE_DIR$/test/fasta/packages" />
+      <excludeFolder url="file://$MODULE_DIR$/test/fasta/parser/packages" />
+      <excludeFolder url="file://$MODULE_DIR$/test/fasta/rasta/packages" />
+      <excludeFolder url="file://$MODULE_DIR$/test/fasta/scanner/packages" />
+      <excludeFolder url="file://$MODULE_DIR$/test/packages" />
+      <excludeFolder url="file://$MODULE_DIR$/test/src/base/packages" />
+      <excludeFolder url="file://$MODULE_DIR$/test/src/packages" />
+      <excludeFolder url="file://$MODULE_DIR$/tool/fasta/packages" />
+      <excludeFolder url="file://$MODULE_DIR$/tool/packages" />
+    </content>
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
     <orderEntry type="library" name="Dart SDK" level="application" />