Remove calls to deprecated MessageLoop methods in chrome.

chrome/browser/chromeos/policy/device_quirks_policy_browsertest.cc

Index: chrome/browser/chromeos/policy/device_quirks_policy_browsertest.cc
diff --git a/chrome/browser/chromeos/policy/device_quirks_policy_browsertest.cc b/chrome/browser/chromeos/policy/device_quirks_policy_browsertest.cc
index e7097e0538654232c2cedcf91dfce31d1be87f63..d3eb9dc583fd26938e37f65b8d4d6819d587201a 100644
--- a/chrome/browser/chromeos/policy/device_quirks_policy_browsertest.cc
+++ b/chrome/browser/chromeos/policy/device_quirks_policy_browsertest.cc
@@ -4,7 +4,7 @@
 
 #include "base/files/file_util.h"
 #include "base/macros.h"
-#include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
 #include "chrome/browser/chromeos/policy/device_policy_cros_browser_test.h"
 #include "chrome/browser/chromeos/policy/proto/chrome_device_policy.pb.h"
 #include "chrome/browser/chromeos/settings/cros_settings.h"
@@ -48,13 +48,13 @@ class DeviceQuirksPolicyTest : public policy::DevicePolicyCrosBrowserTest {
 
  protected:
   void RefreshPolicyAndWaitDeviceSettingsUpdated() {
+    base::RunLoop run_loop;
     std::unique_ptr<CrosSettings::ObserverSubscription> observer =
         CrosSettings::Get()->AddSettingsObserver(
-            kDeviceQuirksDownloadEnabled,
-            base::MessageLoop::current()->QuitWhenIdleClosure());
+            kDeviceQuirksDownloadEnabled, run_loop.QuitWhenIdleClosure());
 
     RefreshDevicePolicy();
-    base::MessageLoop::current()->Run();
+    run_loop.Run();
   }
 
   // Query QuirksManager for icc file, then run msg loop to wait for callback.