base: Convert the remaining uses of MessageLoop::RunUntilIdle to RunLoop variant.

base/metrics/field_trial_unittest.cc

Index: base/metrics/field_trial_unittest.cc
diff --git a/base/metrics/field_trial_unittest.cc b/base/metrics/field_trial_unittest.cc
index 09a38093c0f707c23bc029993bbbcd8856d1833f..0e872ff38e7246809ff11ab2de01d6c0788b3d4f 100644
--- a/base/metrics/field_trial_unittest.cc
+++ b/base/metrics/field_trial_unittest.cc
@@ -2,9 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "base/message_loop.h"
 #include "base/metrics/field_trial.h"
+
+#include "base/message_loop.h"
 #include "base/rand_util.h"
+#include "base/run_loop.h"
 #include "base/stringprintf.h"
 #include "base/string_number_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -450,7 +452,7 @@ TEST_F(FieldTrialTest, CreateTrialsFromStringObserver) {
   TestFieldTrialObserver observer;
   ASSERT_TRUE(FieldTrialList::CreateTrialsFromString("Abc/def/"));
 
-  message_loop_.RunUntilIdle();
+  RunLoop().RunUntilIdle();
   EXPECT_EQ("Abc", observer.trial_name());
   EXPECT_EQ("def", observer.group_name());
 }
@@ -637,7 +639,7 @@ TEST_F(FieldTrialTest, Observe) {
   const int chosen_group = trial->group();
   EXPECT_TRUE(chosen_group == default_group || chosen_group == secondary_group);
 
-  message_loop_.RunUntilIdle();
+  RunLoop().RunUntilIdle();
   EXPECT_EQ(kTrialName, observer.trial_name());
   if (chosen_group == default_group)
     EXPECT_EQ(kDefaultGroupName, observer.group_name());
@@ -659,13 +661,13 @@ TEST_F(FieldTrialTest, ObserveDisabled) {
   trial->Disable();
 
   // Observer shouldn't be notified of a disabled trial.
-  message_loop_.RunUntilIdle();
+  RunLoop().RunUntilIdle();
   EXPECT_TRUE(observer.trial_name().empty());
   EXPECT_TRUE(observer.group_name().empty());
 
   // Observer shouldn't be notified even after a |group()| call.
   EXPECT_EQ(default_group, trial->group());
-  message_loop_.RunUntilIdle();
+  RunLoop().RunUntilIdle();
   EXPECT_TRUE(observer.trial_name().empty());
   EXPECT_TRUE(observer.group_name().empty());
 }
@@ -685,13 +687,13 @@ TEST_F(FieldTrialTest, ObserveForcedDisabled) {
   trial->Disable();
 
   // Observer shouldn't be notified of a disabled trial, even when forced.
-  message_loop_.RunUntilIdle();
+  RunLoop().RunUntilIdle();
   EXPECT_TRUE(observer.trial_name().empty());
   EXPECT_TRUE(observer.group_name().empty());
 
   // Observer shouldn't be notified even after a |group()| call.
   EXPECT_EQ(default_group, trial->group());
-  message_loop_.RunUntilIdle();
+  RunLoop().RunUntilIdle();
   EXPECT_TRUE(observer.trial_name().empty());
   EXPECT_TRUE(observer.group_name().empty());
 }