Poll CanPredictNetworkActions in Predictor class.

chrome/browser/chromeos/login/login_utils_browsertest.cc

Index: chrome/browser/chromeos/login/login_utils_browsertest.cc
diff --git a/chrome/browser/chromeos/login/login_utils_browsertest.cc b/chrome/browser/chromeos/login/login_utils_browsertest.cc
index 62b4be1a4a539b87c0af48691c99df66ae4b9530..48dde882c575183bce718fa8ad7ab8869ec23dbe 100644
--- a/chrome/browser/chromeos/login/login_utils_browsertest.cc
+++ b/chrome/browser/chromeos/login/login_utils_browsertest.cc
@@ -38,6 +38,7 @@
 #include "chrome/browser/rlz/rlz.h"
 #include "chrome/common/chrome_content_client.h"
 #include "chrome/common/chrome_paths.h"
+#include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/test/base/chrome_unit_test_suite.h"
 #include "chrome/test/base/scoped_testing_local_state.h"
@@ -210,6 +211,10 @@ class LoginUtilsTest : public testing::Test,
     command_line->AppendSwitchASCII(
         policy::switches::kDeviceManagementUrl, kDMServer);
 
+    // Disable prefetch so that Predictor can peacefully shut down without a
+    // running IO thread.
+    command_line->AppendSwitch(::switches::kDnsPrefetchDisable);
+
     // DBusThreadManager should be initialized before io_thread_state_, as
     // DBusThreadManager is used from chromeos::ProxyConfigServiceImpl,
     // which is part of io_thread_state_.
@@ -319,10 +324,8 @@ class LoginUtilsTest : public testing::Test,
     for (size_t i = 0; i < profiles.size(); ++i) {
       chrome_browser_net::Predictor* predictor =
           profiles[i]->GetNetworkPredictor();
-      if (predictor) {
-        predictor->EnablePredictorOnIOThread(false);
+      if (predictor)
         predictor->Shutdown();
-      }
     }
   }