Extract InterceptorData from JavaScriptBackend.

pkg/compiler/lib/src/js_emitter/interceptor_stub_generator.dart

Index: pkg/compiler/lib/src/js_emitter/interceptor_stub_generator.dart
diff --git a/pkg/compiler/lib/src/js_emitter/interceptor_stub_generator.dart b/pkg/compiler/lib/src/js_emitter/interceptor_stub_generator.dart
index 77808a88773af3de319231ffdd7d2197dae3dadf..a7853e1a4496b3eab904dab569f5ae5fdba038f9 100644
--- a/pkg/compiler/lib/src/js_emitter/interceptor_stub_generator.dart
+++ b/pkg/compiler/lib/src/js_emitter/interceptor_stub_generator.dart
@@ -46,7 +46,7 @@ class InterceptorStubGenerator {
      */
     jsAst.Statement buildInterceptorCheck(ClassEntity cls) {
       jsAst.Expression condition;
-      assert(backend.isInterceptorClass(cls));
+      assert(backend.interceptorData.isInterceptorClass(cls));
       if (cls == helpers.jsBoolClass) {
         condition = js('(typeof receiver) == "boolean"');
       } else if (cls == helpers.jsIntClass ||
@@ -108,7 +108,7 @@ class InterceptorStubGenerator {
         // unresolved PlainJavaScriptObject by testing for anyNativeClasses.
 
         if (anyNativeClasses) {
-          if (backend.isNativeOrExtendsNative(cls)) hasNative = true;
+          if (backend.nativeData.isNativeOrExtendsNative(cls)) hasNative = true;
         }
       }
     }
@@ -117,7 +117,7 @@ class InterceptorStubGenerator {
     }
     if (hasInt) hasNumber = true;
 
-    if (classes.containsAll(backend.interceptedClasses)) {
+    if (classes.containsAll(backend.interceptorData.interceptedClasses)) {
       // I.e. this is the general interceptor.
       hasNative = anyNativeClasses;
     }
@@ -337,8 +337,9 @@ class InterceptorStubGenerator {
   }
 
   jsAst.Expression generateOneShotInterceptor(jsAst.Name name) {
-    Selector selector = backend.oneShotInterceptors[name];
-    Set<ClassEntity> classes = backend.getInterceptedClassesOn(selector.name);
+    Selector selector = backend.interceptorData.oneShotInterceptors[name];
+    Set<ClassEntity> classes =
+        backend.interceptorData.getInterceptedClassesOn(selector.name);
     jsAst.Name getInterceptorName = namer.nameForGetInterceptor(classes);
 
     List<String> parameterNames = <String>[];