Disable ExtensionWebRequestApiTest.WebRequestBlocking on debug builds (slow, flaky timeout).

chrome/browser/extensions/api/web_request/web_request_apitest.cc

 // Copyright (c) 2012 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 "base/command_line.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/stringprintf.h"
 #include "build/build_config.h"
 #include "chrome/browser/chrome_notification_types.h"
@@ skipping 214 matching lines @@
 IN_PROC_BROWSER_TEST_F(ExtensionWebRequestApiTest,
                        DISABLED_WebRequestAuthRequired) {
   CancelLoginDialog login_dialog_helper;
 
   ASSERT_TRUE(StartEmbeddedTestServer());
   ASSERT_TRUE(RunExtensionSubtest("webrequest", "test_auth_required.html")) <<
       message_;
 }
 
 // This test times out regularly on win_rel trybots. See http://crbug.com/122178
-#if defined(OS_WIN)
+// Also on Linux/ChromiumOS debug builds. https://crbug.com/670415
+#if defined(OS_WIN) || !defined(NDEBUG)
 #define MAYBE_WebRequestBlocking DISABLED_WebRequestBlocking
 #else
 #define MAYBE_WebRequestBlocking WebRequestBlocking
 #endif
 IN_PROC_BROWSER_TEST_F(ExtensionWebRequestApiTest, MAYBE_WebRequestBlocking) {
   ASSERT_TRUE(StartEmbeddedTestServer());
   ASSERT_TRUE(RunExtensionSubtest("webrequest", "test_blocking.html")) <<
       message_;
 }
 
@@ skipping 397 matching lines @@
   ASSERT_TRUE(granter);
   granter->RevokeForTesting();
   base::RunLoop().RunUntilIdle();
   PerformXhrInFrame(main_frame, kHost, port, kXhrPath);
   EXPECT_EQ(xhr_count,
             GetWebRequestCountFromBackgroundPage(extension, profile()));
   EXPECT_EQ(BLOCKED_ACTION_WEB_REQUEST, runner->GetBlockedActions(extension));
 }
 
 }  // namespace extensions