Implement WebPushProvider.unregister() in Chromium.

chrome/browser/services/gcm/push_messaging_browsertest.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 <map>
 #include <string>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 392 matching lines @@
   EXPECT_EQ("permission status - denied", script_result);
 
   ASSERT_TRUE(RunScript("registerPush()", &script_result));
   EXPECT_EQ("AbortError - Registration failed - permission denied",
             script_result);
 
   ASSERT_TRUE(RunScript("hasPermission()", &script_result));
   EXPECT_EQ("permission status - denied", script_result);
 }
 
+IN_PROC_BROWSER_TEST_F(PushMessagingBrowserTest, Unregister) {
+  std::string script_result;
+
+  ASSERT_TRUE(RunScript("registerServiceWorker()", &script_result));
+  ASSERT_EQ("ok - service worker registered", script_result);
+
+  InfoBarResponder accepting_responder(browser(), true);
+  ASSERT_TRUE(RunScript("requestNotificationPermission();", &script_result));
+  EXPECT_EQ("permission status - granted", script_result);
+
+  ASSERT_TRUE(RunScript("registerPush()", &script_result));
+  EXPECT_EQ(std::string(kPushMessagingEndpoint) + " - 1", script_result);
+
+  ASSERT_TRUE(RunScript("unregister()", &script_result));
+  EXPECT_EQ("unregister result: true", script_result);
+}
+
 }  // namespace gcm