Remove backends.

compiler/java/com/google/dart/compiler/DelegatingCompilerConfiguration.java

Index: compiler/java/com/google/dart/compiler/DelegatingCompilerConfiguration.java
diff --git a/compiler/java/com/google/dart/compiler/DelegatingCompilerConfiguration.java b/compiler/java/com/google/dart/compiler/DelegatingCompilerConfiguration.java
index 0ec62b1cc36b14573472d61d601ad80531a60fdf..b261daf7b3dc9ca8d31bb8859bf8c4b945fea3ae 100644
--- a/compiler/java/com/google/dart/compiler/DelegatingCompilerConfiguration.java
+++ b/compiler/java/com/google/dart/compiler/DelegatingCompilerConfiguration.java
@@ -34,11 +34,6 @@ public class DelegatingCompilerConfiguration implements CompilerConfiguration {
   }
 
   @Override
-  public List<Backend> getBackends() {
-    return delegate.getBackends();
-  }
-
-  @Override
   public CompilerMetrics getCompilerMetrics() {
     return delegate.getCompilerMetrics();
   }
@@ -69,21 +64,11 @@ public class DelegatingCompilerConfiguration implements CompilerConfiguration {
   }
 
   @Override
-  public File getOutputFilename() {
-    return delegate.getOutputFilename();
-  }
-
-  @Override
   public File getOutputDirectory() {
     return delegate.getOutputDirectory();
   }
 
   @Override
-  public boolean checkOnly() {
-    return delegate.checkOnly();
-  }
-
-  @Override
   public boolean expectEntryPoint() {
     return delegate.expectEntryPoint();
   }