Cleanup: Remove various DoNothing functions and use base::DoNothing().

chrome/browser/metrics/variations/variations_request_scheduler_unittest.cc

Index: chrome/browser/metrics/variations/variations_request_scheduler_unittest.cc
diff --git a/chrome/browser/metrics/variations/variations_request_scheduler_unittest.cc b/chrome/browser/metrics/variations/variations_request_scheduler_unittest.cc
index 493275b5e0a5fb3917009685d70a7743e13ef066..e485602523dc39cc9b84f2339ed187bab8f6dc14 100644
--- a/chrome/browser/metrics/variations/variations_request_scheduler_unittest.cc
+++ b/chrome/browser/metrics/variations/variations_request_scheduler_unittest.cc
@@ -5,22 +5,16 @@
 #include "chrome/browser/metrics/variations/variations_request_scheduler.h"
 
 #include "base/bind.h"
+#include "base/bind_helpers.h"
 #include "base/message_loop/message_loop.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace chrome_variations {
 
-namespace {
-
-void DoNothing() {
-}
-
-}  // namespace
-
 TEST(VariationsRequestSchedulerTest, ScheduleFetchShortly) {
   base::MessageLoopForUI message_loop_;
 
-  const base::Closure task = base::Bind(&DoNothing);
+  const base::Closure task = base::Bind(&base::DoNothing);
   VariationsRequestScheduler scheduler(task);
   EXPECT_FALSE(scheduler.one_shot_timer_.IsRunning());