Replace base::MakeUnique with std::make_unique in base/.

Bug: 755727
Change-Id: Ia785171c1c9fd5396def9e381bbc1387e0eee0a1
Reviewed-on: https://chromium-review.googlesource.com/616842
Commit-Queue: Jeremy Roman <jbroman@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#494995}

CrOS-Libchrome-Original-Commit: 9532f25fadd2411540dc278fa934b781cf83f76a
diff --git a/base/run_loop_unittest.cc b/base/run_loop_unittest.cc
index 5384eaf..ac4f896 100644
--- a/base/run_loop_unittest.cc
+++ b/base/run_loop_unittest.cc
@@ -124,7 +124,7 @@
 
   void BindToCurrentThread() {
     thread_task_runner_handle_ =
-        MakeUnique<ThreadTaskRunnerHandle>(simple_task_runner_);
+        std::make_unique<ThreadTaskRunnerHandle>(simple_task_runner_);
     run_loop_client_ = RunLoop::RegisterDelegateForCurrentThread(this);
   }
 
@@ -206,10 +206,10 @@
   RunLoopTestEnvironment(RunLoopTestType type) {
     switch (type) {
       case RunLoopTestType::kRealEnvironment:
-        task_environment_ = base::MakeUnique<test::ScopedTaskEnvironment>();
+        task_environment_ = std::make_unique<test::ScopedTaskEnvironment>();
         break;
       case RunLoopTestType::kTestDelegate:
-        test_delegate_ = base::MakeUnique<TestDelegate>();
+        test_delegate_ = std::make_unique<TestDelegate>();
         test_delegate_->BindToCurrentThread();
         break;
     }