Revert "Moves the 'import_*.config' files in dart-sdk into a new directory"

compiler/java/com/google/dart/compiler/SystemLibraryManager.java

Index: compiler/java/com/google/dart/compiler/SystemLibraryManager.java
diff --git a/compiler/java/com/google/dart/compiler/SystemLibraryManager.java b/compiler/java/com/google/dart/compiler/SystemLibraryManager.java
index d5824c63987115f1af51971e5a9178abbc3ebb0d..ee06b332fa5fe861166dcf39b800d585af3fd7b1 100644
--- a/compiler/java/com/google/dart/compiler/SystemLibraryManager.java
+++ b/compiler/java/com/google/dart/compiler/SystemLibraryManager.java
@@ -125,11 +125,8 @@ public class SystemLibraryManager {
     return result;
   }
 
-  /**
-   * The import config files have the path: dart-sdk/_internal/config/import_<platform>.config
-   */
   protected InputStream getImportConfigStream() {
-    File file = new File(new File(new File(sdkLibPath, "_internal"), "config"),
+    File file = new File(new File(sdkLibPath, "config"),
                          String.format(IMPORT_CONFIG, platformName));
     if (!file.exists()) {
       throw new InternalCompilerException("Failed to find " + file.toString()