Cleanup nits in ImportantFileWriter and JsonPrefStore.

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 d376cdc35ab33cd2491bb69c114f4981ad3eabf1..71900c93d5e7c63326b6b96fb5e852c0a1e92afc 100644
--- a/base/files/important_file_writer_unittest.cc
+++ b/base/files/important_file_writer_unittest.cc
@@ -145,8 +145,9 @@ TEST_F(ImportantFileWriterTest, BasicWithSuccessfulWriteObserver) {
 }
 
 TEST_F(ImportantFileWriterTest, ScheduleWrite) {
-  ImportantFileWriter writer(file_, ThreadTaskRunnerHandle::Get());
-  writer.set_commit_interval(TimeDelta::FromMilliseconds(25));
+  ImportantFileWriter writer(file_,
+                             ThreadTaskRunnerHandle::Get(),
+                             TimeDelta::FromMilliseconds(25));
   EXPECT_FALSE(writer.HasPendingWrite());
   DataSerializer serializer("foo");
   writer.ScheduleWrite(&serializer);
@@ -177,8 +178,9 @@ TEST_F(ImportantFileWriterTest, DoScheduledWrite) {
 }
 
 TEST_F(ImportantFileWriterTest, BatchingWrites) {
-  ImportantFileWriter writer(file_, ThreadTaskRunnerHandle::Get());
-  writer.set_commit_interval(TimeDelta::FromMilliseconds(25));
+  ImportantFileWriter writer(file_,
+                             ThreadTaskRunnerHandle::Get(),
+                             TimeDelta::FromMilliseconds(25));
   DataSerializer foo("foo"), bar("bar"), baz("baz");
   writer.ScheduleWrite(&foo);
   writer.ScheduleWrite(&bar);