Snip unused imports, fix checkstyle break

git-svn-id: https://google-web-toolkit.googlecode.com/svn/branches/farewellSwt@6178 8db76d5a-ed1c-0410-87a9-c151d255dfc7
diff --git a/dev/core/src/com/google/gwt/dev/shell/LowLevel.java b/dev/core/src/com/google/gwt/dev/shell/LowLevel.java
index 4e0102b..44ee910 100644
--- a/dev/core/src/com/google/gwt/dev/shell/LowLevel.java
+++ b/dev/core/src/com/google/gwt/dev/shell/LowLevel.java
@@ -17,8 +17,6 @@
 
 import com.google.gwt.util.tools.Utility;
 
-import java.io.File;
-import java.io.IOException;
 import java.lang.reflect.Field;
 
 /**