Revert of Reland: Lazily initialize MessageLoop for faster thread startup

base/message_loop/message_pump_perftest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/bind.h"
 #include "base/format_macros.h"
 #include "base/memory/scoped_vector.h"
 #include "base/strings/stringprintf.h"
 #include "base/synchronization/condition_variable.h"
 #include "base/synchronization/lock.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/thread.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/perf/perf_test.h"
 
 #if defined(OS_ANDROID)
 #include "base/android/java_handler_thread.h"
 #endif
 
 namespace base {
+namespace {
 
 class ScheduleWorkTest : public testing::Test {
  public:
   ScheduleWorkTest() : counter_(0) {}
 
   void Increment(uint64_t amount) { counter_ += amount; }
 
   void Schedule(int index) {
     base::TimeTicks start = base::TimeTicks::Now();
     base::TimeTicks thread_start;
@@ skipping 183 matching lines @@
 
 TEST_F(ScheduleWorkTest, ThreadTimeToJavaFromTwoThreads) {
   ScheduleWork(MessageLoop::TYPE_JAVA, 2);
 }
 
 TEST_F(ScheduleWorkTest, ThreadTimeToJavaFromFourThreads) {
   ScheduleWork(MessageLoop::TYPE_JAVA, 4);
 }
 #endif
 
+static void DoNothing() {
+}
+
 class FakeMessagePump : public MessagePump {
  public:
   FakeMessagePump() {}
   ~FakeMessagePump() override {}
 
   void Run(Delegate* delegate) override {}
 
   void Quit() override {}
   void ScheduleWork() override {}
   void ScheduleDelayedWork(const TimeTicks& delayed_work_time) override {}
@@ skipping 42 matching lines @@
 }
 
 TEST_F(PostTaskTest, TenTasksPerReload) {
   Run(10000, 10);
 }
 
 TEST_F(PostTaskTest, OneHundredTasksPerReload) {
   Run(1000, 100);
 }
 
+}  // namespace
 }  // namespace base