[Extensions Bindings] Add ExtensionBindingsSystem interface; hook it up

extensions/renderer/native_extension_bindings_system_unittest.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "extensions/renderer/native_extension_bindings_system.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
 #include "components/crx_file/id_util.h"
 #include "extensions/common/extension.h"
@@ skipping 102 matching lines @@
   scoped_refptr<Extension> extension = CreateExtension("foo", {"idle"});
   RegisterExtension(extension->id());
 
   v8::HandleScope handle_scope(isolate());
   v8::Local<v8::Context> context = ContextLocal();
 
   ScriptContext* script_context = CreateScriptContext(
       context, extension.get(), Feature::BLESSED_EXTENSION_CONTEXT);
   script_context->set_url(extension->url());
 
-  bindings_system()->CreateAPIsInContext(script_context);
+  bindings_system()->UpdateBindingsForContext(script_context);
 
   // chrome.idle.queryState should exist.
   v8::Local<v8::Value> chrome =
       GetPropertyFromObject(context->Global(), context, "chrome");
   ASSERT_FALSE(chrome.IsEmpty());
   ASSERT_TRUE(chrome->IsObject());
 
   v8::Local<v8::Value> idle = GetPropertyFromObject(
       v8::Local<v8::Object>::Cast(chrome), context, "idle");
   ASSERT_FALSE(idle.IsEmpty());
@@ skipping 36 matching lines @@
   // Validate the params that would be sent to the browser.
   EXPECT_EQ(extension->id(), last_params().extension_id);
   EXPECT_EQ("idle.queryState", last_params().name);
   EXPECT_EQ(extension->url(), last_params().source_url);
   EXPECT_EQ(-1, last_params().source_tab_id);
   EXPECT_TRUE(last_params().has_callback);
   EXPECT_TRUE(
       last_params().arguments.Equals(ListValueFromString("[30]").get()));
 
   // Respond and validate.
-  bindings_system()->OnResponse(last_params().request_id, true,
-                                *ListValueFromString("['active']"),
-                                std::string());
+  bindings_system()->HandleResponse(last_params().request_id, true,
+                                    *ListValueFromString("['active']"),
+                                    std::string());
 
   std::unique_ptr<base::Value> result_value = GetBaseValuePropertyFromObject(
       context->Global(), context, "responseState");
   ASSERT_TRUE(result_value);
   EXPECT_EQ("\"active\"", ValueToString(*result_value));
 }
 
 }  // namespace extensions