fix for high resolution timer on windows.

base/message_loop/message_loop_unittest.cc

Index: base/message_loop/message_loop_unittest.cc
diff --git a/base/message_loop/message_loop_unittest.cc b/base/message_loop/message_loop_unittest.cc
index 866c20bc7bdbb4f40c1664d809e4e987e3c77417..0a6e817f33f895022fff5a9b41fe14950f7ea8b9 100644
--- a/base/message_loop/message_loop_unittest.cc
+++ b/base/message_loop/message_loop_unittest.cc
@@ -726,6 +726,7 @@ TEST(MessageLoopTest, WaitForIO) {
 
 TEST(MessageLoopTest, HighResolutionTimer) {
   MessageLoop loop;
+  Time::EnableHighResolutionTimer(true);
 
   const TimeDelta kFastTimer = TimeDelta::FromMilliseconds(5);
   const TimeDelta kSlowTimer = TimeDelta::FromMilliseconds(100);
@@ -744,6 +745,7 @@ TEST(MessageLoopTest, HighResolutionTimer) {
   EXPECT_FALSE(loop.HasHighResolutionTasks());
   loop.Run();
   EXPECT_FALSE(loop.HasHighResolutionTasks());
+  Time::EnableHighResolutionTimer(false);
 }
 
 #endif  // defined(OS_WIN)