Revert of Temporarily disable a failing test.

chrome/browser/media/chrome_webrtc_browsertest.cc

 // Copyright 2013 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/strings/stringprintf.h"
 #include "chrome/browser/media/webrtc_browsertest_base.h"
 #include "chrome/browser/media/webrtc_browsertest_common.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_tabstrip.h"
@@ skipping 26 matching lines @@
 
     // Flag used by TestWebAudioMediaStream to force garbage collection.
     command_line->AppendSwitchASCII(switches::kJavaScriptFlags, "--expose-gc");
   }
 };
 
 #if defined(OS_CHROMEOS)
 #define MAYBE_RunsAudioVideoWebRTCCallInTwoTabs \
     DISABLED_RunsAudioVideoWebRTCCallInTwoTabs
 #else
-// TODO(pkasting): http://crbug.com/471132 Temporarily disabled this test due to
-// unexplained failure.
 #define MAYBE_RunsAudioVideoWebRTCCallInTwoTabs \
-    DISABLED_RunsAudioVideoWebRTCCallInTwoTabs
+    RunsAudioVideoWebRTCCallInTwoTabs
 #endif
 
 IN_PROC_BROWSER_TEST_F(WebRtcBrowserTest,
                        MAYBE_RunsAudioVideoWebRTCCallInTwoTabs) {
   if (OnWinXp()) return;
 
   ASSERT_TRUE(embedded_test_server()->InitializeAndWaitUntilReady());
 
   content::WebContents* left_tab =
       OpenTestPageAndGetUserMediaInNewTab(kMainWebrtcTestHtmlPage);
@@ skipping 24 matching lines @@
   GURL url(embedded_test_server()->GetURL("/webrtc/webaudio_crash.html"));
   ui_test_utils::NavigateToURL(browser(), url);
   content::WebContents* tab =
       browser()->tab_strip_model()->GetActiveWebContents();
 
   // A sleep is necessary to be able to detect the crash.
   test::SleepInJavascript(tab, 1000);
 
   ASSERT_FALSE(tab->IsCrashed());
 }