Reenable DevToolsSanityTest.TestDeviceEmulation.

chrome/browser/devtools/devtools_sanity_browsertest.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/bind.h"
 #include "base/cancelable_callback.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/path_service.h"
@@ skipping 772 matching lines @@
 #if defined(OS_WIN)
 // Flaking on windows swarm try runs: crbug.com/409285.
 #define MAYBE_TestConsoleOnNavigateBack DISABLED_TestConsoleOnNavigateBack
 #else
 #define MAYBE_TestConsoleOnNavigateBack TestConsoleOnNavigateBack
 #endif
 IN_PROC_BROWSER_TEST_F(DevToolsSanityTest, MAYBE_TestConsoleOnNavigateBack) {
   RunTest("testConsoleOnNavigateBack", kNavigateBackTestPage);
 }
 
-// https://crbug.com/397889
-IN_PROC_BROWSER_TEST_F(DevToolsSanityTest, DISABLED_TestDeviceEmulation) {
+IN_PROC_BROWSER_TEST_F(DevToolsSanityTest, TestDeviceEmulation) {
   RunTest("testDeviceMetricsOverrides", "about:blank");
 }
 
 
 // Tests that external navigation from inspector page is always handled by
 // DevToolsWindow and results in inspected page navigation.
 IN_PROC_BROWSER_TEST_F(DevToolsSanityTest, TestDevToolsExternalNavigation) {
   OpenDevToolsWindow(kDebuggerTestPage, true);
   GURL url = test_server()->GetURL(kNavigateBackTestPage);
   ui_test_utils::UrlLoadObserver observer(url,
@@ skipping 111 matching lines @@
 
 IN_PROC_BROWSER_TEST_F(RemoteDebuggingTest, RemoteDebugger) {
 #if defined(OS_WIN) && defined(USE_ASH)
   // Disable this test in Metro+Ash for now (http://crbug.com/262796).
   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kAshBrowserTests))
     return;
 #endif
 
   ASSERT_TRUE(RunExtensionTest("target_list")) << message_;
 }