Replacing most of web_task.h with base::Closure + base::WeakPtrFactory.

components/test_runner/mock_web_midi_accessor.cc

 // Copyright 2014 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 "components/test_runner/mock_web_midi_accessor.h"
 
+#include "base/bind.h"
+#include "base/bind_helpers.h"
 #include "base/macros.h"
 #include "components/test_runner/test_interfaces.h"
 #include "components/test_runner/test_runner.h"
+#include "components/test_runner/web_task.h"
 #include "components/test_runner/web_test_delegate.h"
 #include "components/test_runner/web_test_runner.h"
+#include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/platform/modules/webmidi/WebMIDIAccessorClient.h"
 
 namespace test_runner {
 
-namespace {
-
-class DidStartSessionTask : public WebMethodTask<MockWebMIDIAccessor> {
- public:
-  DidStartSessionTask(MockWebMIDIAccessor* object,
-                      blink::WebMIDIAccessorClient* client,
-                      bool result)
-      : WebMethodTask<MockWebMIDIAccessor>(object),
-        client_(client),
-        result_(result) {}
-
-  void RunIfValid() override {
-    client_->didStartSession(result_, "InvalidStateError", "");
-  }
-
- private:
-  blink::WebMIDIAccessorClient* client_;
-  bool result_;
-
-  DISALLOW_COPY_AND_ASSIGN(DidStartSessionTask);
-};
-
-}  // namespace
-
 MockWebMIDIAccessor::MockWebMIDIAccessor(blink::WebMIDIAccessorClient* client,
                                          TestInterfaces* interfaces)
-    : client_(client), interfaces_(interfaces) {
-}
+    : client_(client), interfaces_(interfaces), weak_factory_(this) {}
 
 MockWebMIDIAccessor::~MockWebMIDIAccessor() {
 }
 
 void MockWebMIDIAccessor::startSession() {
   // Add a mock input and output port.
   blink::WebMIDIAccessorClient::MIDIPortState state =
       blink::WebMIDIAccessorClient::MIDIPortStateConnected;
   client_->didAddInputPort("MockInputID",
                            "MockInputManufacturer",
                            "MockInputName",
                            "MockInputVersion",
                            state);
   client_->didAddOutputPort("MockOutputID",
                             "MockOutputManufacturer",
                             "MockOutputName",
                             "MockOutputVersion",
                             state);
-  interfaces_->GetDelegate()->PostTask(new DidStartSessionTask(
-      this, client_, interfaces_->GetTestRunner()->midiAccessorResult()));
+  interfaces_->GetDelegate()->PostTask(new WebCallbackTask(base::Bind(
+      &MockWebMIDIAccessor::ReportStartedSession, weak_factory_.GetWeakPtr(),
+      interfaces_->GetTestRunner()->midiAccessorResult())));
+}
+
+void MockWebMIDIAccessor::ReportStartedSession(bool success) {
+  client_->didStartSession(success, "InvalidStateError", "");
 }
 
 void MockWebMIDIAccessor::sendMIDIData(unsigned port_index,
                                        const unsigned char* data,
                                        size_t length,
                                        double timestamp) {
   // Emulate a loopback device for testing.
   client_->didReceiveMIDIData(port_index, data, length, timestamp);
 }
 
 }  // namespace test_runner