Reduce usage of MessageLoopProxy in base/

base/files/important_file_writer_unittest.cc

Index: base/files/important_file_writer_unittest.cc
diff --git a/base/files/important_file_writer_unittest.cc b/base/files/important_file_writer_unittest.cc
index 71242eeaabe59d5ded63d6696bde84371f848364..738c6f4a2ebd25745a30efe738f376a616e48277 100644
--- a/base/files/important_file_writer_unittest.cc
+++ b/base/files/important_file_writer_unittest.cc
@@ -12,6 +12,7 @@
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
+#include "base/thread_task_runner_handle.h"
 #include "base/threading/thread.h"
 #include "base/time/time.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -97,7 +98,7 @@ class ImportantFileWriterTest : public testing::Test {
 };
 
 TEST_F(ImportantFileWriterTest, Basic) {
-  ImportantFileWriter writer(file_, MessageLoopProxy::current().get());
+  ImportantFileWriter writer(file_, ThreadTaskRunnerHandle::Get());
   EXPECT_FALSE(PathExists(writer.path()));
   EXPECT_FALSE(successful_write_observer_.GetAndResetObservationState());
   writer.WriteNow("foo");
@@ -109,7 +110,7 @@ TEST_F(ImportantFileWriterTest, Basic) {
 }
 
 TEST_F(ImportantFileWriterTest, BasicWithSuccessfulWriteObserver) {
-  ImportantFileWriter writer(file_, MessageLoopProxy::current().get());
+  ImportantFileWriter writer(file_, ThreadTaskRunnerHandle::Get());
   EXPECT_FALSE(PathExists(writer.path()));
   EXPECT_FALSE(successful_write_observer_.GetAndResetObservationState());
   successful_write_observer_.ObserveNextSuccessfulWrite(&writer);
@@ -143,7 +144,7 @@ TEST_F(ImportantFileWriterTest, BasicWithSuccessfulWriteObserver) {
 }
 
 TEST_F(ImportantFileWriterTest, ScheduleWrite) {
-  ImportantFileWriter writer(file_, MessageLoopProxy::current().get());
+  ImportantFileWriter writer(file_, ThreadTaskRunnerHandle::Get());
   writer.set_commit_interval(TimeDelta::FromMilliseconds(25));
   EXPECT_FALSE(writer.HasPendingWrite());
   DataSerializer serializer("foo");
@@ -160,7 +161,7 @@ TEST_F(ImportantFileWriterTest, ScheduleWrite) {
 }
 
 TEST_F(ImportantFileWriterTest, DoScheduledWrite) {
-  ImportantFileWriter writer(file_, MessageLoopProxy::current().get());
+  ImportantFileWriter writer(file_, ThreadTaskRunnerHandle::Get());
   EXPECT_FALSE(writer.HasPendingWrite());
   DataSerializer serializer("foo");
   writer.ScheduleWrite(&serializer);
@@ -177,7 +178,7 @@ TEST_F(ImportantFileWriterTest, DoScheduledWrite) {
 }
 
 TEST_F(ImportantFileWriterTest, BatchingWrites) {
-  ImportantFileWriter writer(file_, MessageLoopProxy::current().get());
+  ImportantFileWriter writer(file_, ThreadTaskRunnerHandle::Get());
   writer.set_commit_interval(TimeDelta::FromMilliseconds(25));
   DataSerializer foo("foo"), bar("bar"), baz("baz");
   writer.ScheduleWrite(&foo);