Remove remaining calls to deprecated MessageLoop methods on Mac.

base/test/ios/wait_util.mm

Index: base/test/ios/wait_util.mm
diff --git a/base/test/ios/wait_util.mm b/base/test/ios/wait_util.mm
index c69b692eff168eda7f90ae45e09cbc1bf344a025..5819e33a2b265ef8974cdb5ca9f18d47350019cc 100644
--- a/base/test/ios/wait_util.mm
+++ b/base/test/ios/wait_util.mm
@@ -8,7 +8,7 @@
 
 #include "base/logging.h"
 #include "base/mac/scoped_nsobject.h"
-#include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
 #include "base/test/test_timeouts.h"
 #include "base/timer/elapsed_timer.h"
 
@@ -29,7 +29,7 @@ TimeDelta TimeUntilCondition(ProceduralBlock action,
   while (timer.Elapsed() < timeout && (!condition || !condition())) {
     SpinRunLoopWithMaxDelay(spin_delay);
     if (message_loop) {
-      message_loop->RunUntilIdle();
+      RunLoop().RunUntilIdle();
     }
   }
   TimeDelta elapsed = timer.Elapsed();