Implement WebPushProvider.unregister() in Chromium.

chrome/browser/services/gcm/push_messaging_browsertest.cc

Index: chrome/browser/services/gcm/push_messaging_browsertest.cc
diff --git a/chrome/browser/services/gcm/push_messaging_browsertest.cc b/chrome/browser/services/gcm/push_messaging_browsertest.cc
index 6dfd3b1ac50d09073524549acca3712bdec53ab3..33b8ce24c6c2deaf5181731b6c8acd15f8bbffd3 100644
--- a/chrome/browser/services/gcm/push_messaging_browsertest.cc
+++ b/chrome/browser/services/gcm/push_messaging_browsertest.cc
@@ -410,4 +410,21 @@ IN_PROC_BROWSER_TEST_F(PushMessagingBrowserTest, HasPermissionSaysDenied) {
   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