Remove Collection, Collections and clean up List/Set/Queue implementations of retain/remove.

sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart

 // Copyright (c) 2012, 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.
 
 part of js_backend;
 
 /**
  * A function element that represents a closure call. The signature is copied
  * from the given element.
  */
@@ skipping 1711 matching lines @@
   Function computeClassFilter() {
     Set<ClassElement> unneededClasses = new Set<ClassElement>();
     // The [Bool] class is not marked as abstract, but has a factory
     // constructor that always throws. We never need to emit it.
     unneededClasses.add(compiler.boolClass);
 
     // Go over specialized interceptors and then constants to know which
     // interceptors are needed.
     Set<ClassElement> needed = new Set<ClassElement>();
     backend.specializedGetInterceptors.forEach(
-        (_, Collection<ClassElement> elements) {
+        (_, Iterable<ClassElement> elements) {
           needed.addAll(elements);
         }
     );
 
     // Add interceptors referenced by constants.
     ConstantHandler handler = compiler.constantHandler;
     List<Constant> constants = handler.getConstantsForEmission();
     for (Constant constant in constants) {
       if (constant is InterceptorConstant) {
         needed.add(constant.dispatchedType.element);
@@ skipping 670 matching lines @@
   } else {
     ${mainCall};
   }
 }
 """);
     addComment('END invoke [main].', buffer);
   }
 
   void emitGetInterceptorMethod(CodeBuffer buffer,
                                 String key,
-                                Collection<ClassElement> classes) {
+                                Iterable<ClassElement> classes) {
     jsAst.Statement buildReturnInterceptor(ClassElement cls) {
       return js.return_(js(namer.isolateAccess(cls))['prototype']);
     }
 
     /**
      * Build a JavaScrit AST node for doing a type check on
      * [cls]. [cls] must be an interceptor class.
      */
     jsAst.Statement buildInterceptorCheck(ClassElement cls) {
       jsAst.Expression condition;
@@ skipping 149 matching lines @@
         compiler));
     buffer.write(N);
   }
 
   /**
    * Emit all versions of the [:getInterceptor:] method.
    */
   void emitGetInterceptorMethods(CodeBuffer buffer) {
     var specializedGetInterceptors = backend.specializedGetInterceptors;
     for (String name in specializedGetInterceptors.keys.toList()..sort()) {
-      Collection<ClassElement> classes = specializedGetInterceptors[name];
+      Iterable<ClassElement> classes = specializedGetInterceptors[name];
       emitGetInterceptorMethod(buffer, name, classes);
     }
   }
 
   /**
    * Compute all the classes that must be emitted.
    */
   void computeNeededClasses() {
     instantiatedClasses =
         compiler.codegenWorld.instantiatedClasses.where(computeClassFilter())
@@ skipping 453 matching lines @@
 """;
 const String HOOKS_API_USAGE = """
 // The code supports the following hooks:
 // dartPrint(message)   - if this function is defined it is called
 //                        instead of the Dart [print] method.
 // dartMainRunner(main) - if this function is defined, the Dart [main]
 //                        method will not be invoked directly.
 //                        Instead, a closure that will invoke [main] is
 //                        passed to [dartMainRunner].
 """;