Remove dartc optimizing backend.

dart/compiler/java/com/google/dart/compiler/backend/js/OptimizationStrategy.java

Index: dart/compiler/java/com/google/dart/compiler/backend/js/OptimizationStrategy.java
diff --git a/dart/compiler/java/com/google/dart/compiler/backend/js/OptimizationStrategy.java b/dart/compiler/java/com/google/dart/compiler/backend/js/OptimizationStrategy.java
deleted file mode 100644
index 69dfb6ca11b485d9d30830343a30bb4bec3f179d..0000000000000000000000000000000000000000
--- a/dart/compiler/java/com/google/dart/compiler/backend/js/OptimizationStrategy.java
+++ /dev/null
@@ -1,42 +0,0 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-package com.google.dart.compiler.backend.js;
-
-import com.google.dart.compiler.ast.DartArrayAccess;
-import com.google.dart.compiler.ast.DartBinaryExpression;
-import com.google.dart.compiler.ast.DartExpression;
-import com.google.dart.compiler.ast.DartFunctionExpression;
-import com.google.dart.compiler.ast.DartMethodInvocation;
-import com.google.dart.compiler.ast.DartUnaryExpression;
-import com.google.dart.compiler.backend.common.TypeHeuristic.FieldKind;
-import com.google.dart.compiler.resolver.ClassElement;
-import com.google.dart.compiler.resolver.ConstructorElement;
-import com.google.dart.compiler.resolver.Element;
-import com.google.dart.compiler.resolver.FieldElement;
-
-interface OptimizationStrategy {
-
-  boolean canSkipOperatorShim(DartBinaryExpression expr);
-
-  boolean canSkipOperatorShim(DartUnaryExpression expr);
-
-  boolean canSkipArrayAccessShim(DartArrayAccess array, boolean isAssignee);
-
-  FieldElement findOptimizableFieldElementFor(DartExpression expr, FieldKind fieldKind);
-
-  Element findElementFor(DartMethodInvocation expr);
-
-  boolean canSkipNormalization(DartBinaryExpression expr);
-
-  boolean canSkipNormalization(DartUnaryExpression expr);
-
-  boolean canInlineInitializers(ConstructorElement constructorElement);
-
-  boolean canEmitOptimizedClassConstructor(ClassElement classElement);
-
-  boolean isWhitelistedNativeField(FieldElement field, FieldKind fieldKind);
-
-  boolean canOptimizeFunctionExpressionBind(DartFunctionExpression expr);
-}