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

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

Index: sdk/lib/_internal/compiler/implementation/js_backend/namer.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_backend/namer.dart b/sdk/lib/_internal/compiler/implementation/js_backend/namer.dart
index 0f5f6beb57cf858d383cee66ef13dcea0076096c..07c32c033c03eccc116f8345772dff0d4104d458 100644
--- a/sdk/lib/_internal/compiler/implementation/js_backend/namer.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_backend/namer.dart
@@ -536,7 +536,7 @@ class Namer implements ClosureNamer {
     return name;
   }
 
-  String getInterceptorSuffix(Collection<ClassElement> classes) {
+  String getInterceptorSuffix(Iterable<ClassElement> classes) {
     String abbreviate(ClassElement cls) {
       if (cls == compiler.objectClass) return "o";
       JavaScriptBackend backend = compiler.backend;
@@ -565,7 +565,7 @@ class Namer implements ClosureNamer {
     return names.join();
   }
 
-  String getInterceptorName(Element element, Collection<ClassElement> classes) {
+  String getInterceptorName(Element element, Iterable<ClassElement> classes) {
     JavaScriptBackend backend = compiler.backend;
     if (classes.contains(backend.jsInterceptorClass)) {
       // If the base Interceptor class is in the set of intercepted classes, we
@@ -578,7 +578,7 @@ class Namer implements ClosureNamer {
   }
 
   String getOneShotInterceptorName(Selector selector,
-                                   Collection<ClassElement> classes) {
+                                   Iterable<ClassElement> classes) {
     JavaScriptBackend backend = compiler.backend;
     // The one-shot name is a global name derived from the invocation name.  To
     // avoid instability we would like the names to be unique and not clash with