Disable flaky test ServiceWorkerTest.WorkerRefCount on Linux

chrome/browser/extensions/service_worker_apitest.cc

 // Copyright 2015 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 <stdint.h>
 
 #include "base/bind_helpers.h"
 #include "base/macros.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 637 matching lines @@
   ASSERT_EQ("chrome.tabs.create callback", result);
   EXPECT_EQ(starting_tab_count + 1, browser()->tab_strip_model()->count());
 
   // Check extension shutdown path.
   UnloadExtension(extension->id());
   EXPECT_EQ(starting_tab_count, browser()->tab_strip_model()->count());
 }
 
 // Tests that worker ref count increments while extension API function is
 // active.
-IN_PROC_BROWSER_TEST_F(ServiceWorkerTest, WorkerRefCount) {
+
+// Flaky on Linux and ChromeOS, https://crbug.com/702126
+#if defined(OS_LINUX)
+#define MAYBE_WorkerRefCount DISABLED_WorkerRefCount
+#else
+#define MAYBE_WorkerRefCount WorkerRefCount
+#endif
+IN_PROC_BROWSER_TEST_F(ServiceWorkerTest, MAYBE_WorkerRefCount) {
   // Extensions APIs from SW are only enabled on trunk.
   ScopedCurrentChannel current_channel_override(version_info::Channel::UNKNOWN);
   const Extension* extension = LoadExtensionWithFlags(
       test_data_dir_.AppendASCII("service_worker/api_worker_ref_count"),
       kFlagNone);
   ASSERT_TRUE(extension);
   ui_test_utils::NavigateToURL(browser(),
                                extension->GetResourceURL("page.html"));
   content::WebContents* web_contents =
       browser()->tab_strip_model()->GetActiveWebContents();
@@ skipping 194 matching lines @@
   message.sender_id = "1234567890";
   message.raw_data = "testdata";
   message.decrypted = true;
   push_service()->SetMessageCallbackForTesting(run_loop.QuitClosure());
   push_service()->OnMessage(app_identifier.app_id(), message);
   EXPECT_TRUE(push_message_listener.WaitUntilSatisfied());
   run_loop.Run();  // Wait until the message is handled by push service.
 }
 
 }  // namespace extensions