Merge QueueFilter with EnqueuerStrategy

pkg/compiler/lib/src/js_backend/enqueuer.dart

Index: pkg/compiler/lib/src/js_backend/enqueuer.dart
diff --git a/pkg/compiler/lib/src/js_backend/enqueuer.dart b/pkg/compiler/lib/src/js_backend/enqueuer.dart
index f9c3dad063e00472a453bd7446f3ac52e2e17c2f..ff783ac8e28758a6b68d1eccc4b4bff49110c0f2 100644
--- a/pkg/compiler/lib/src/js_backend/enqueuer.dart
+++ b/pkg/compiler/lib/src/js_backend/enqueuer.dart
@@ -86,8 +86,6 @@ class CodegenEnqueuer extends EnqueuerImpl {
   /// Returns [:true:] if this enqueuer is the resolution enqueuer.
   bool get isResolutionQueue => false;
 
-  QueueFilter get filter => _compiler.enqueuerFilter;
-
   DiagnosticReporter get reporter => _compiler.reporter;
 
   /**
@@ -156,7 +154,7 @@ class CodegenEnqueuer extends EnqueuerImpl {
   }
 
   bool checkNoEnqueuedInvokedInstanceMethods() {
-    return filter.checkNoEnqueuedInvokedInstanceMethods(this);
+    return strategy.checkEnqueuerConsistency(this);
   }
 
   void processInstantiatedClassMembers(ClassElement cls) {
@@ -449,7 +447,7 @@ class CodegenEnqueuer extends EnqueuerImpl {
     do {
       while (queue.isNotEmpty) {
         // TODO(johnniwinther): Find an optimal process order.
-        filter.processWorkItem(f, queue.removeLast());
+        strategy.processWorkItem(f, queue.removeLast());
       }
       List recents = recentClasses.toList(growable: false);
       recentClasses.clear();