Remove .iml files from the repository.

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
deleted file mode 100644
index 33eb27ce3f8818c4529c617fd5b4358bf2ec86a4..0000000000000000000000000000000000000000
--- a/pkg/front_end/front_end.iml
+++ /dev/null
@@ -1,27 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<module type="WEB_MODULE" version="4">
-  <component name="NewModuleRootManager" inherit-compiler-output="true">
-    <exclude-output />
-    <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/scanner/packages" />
-      <excludeFolder url="file://$MODULE_DIR$/test/fasta/testing/packages" />
-      <excludeFolder url="file://$MODULE_DIR$/test/fasta/type_inference/packages" />
-      <excludeFolder url="file://$MODULE_DIR$/test/packages" />
-      <excludeFolder url="file://$MODULE_DIR$/test/src/base/packages" />
-      <excludeFolder url="file://$MODULE_DIR$/test/src/incremental/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" />
-    <orderEntry type="library" name="Dart SDK" level="project" />
-    <orderEntry type="library" name="Dart Packages" level="project" />
-  </component>
-</module>