Move Touch to base namespace, remove SetLastModifiedTime.

net/disk_cache/simple/simple_index_file_unittest.cc

Index: net/disk_cache/simple/simple_index_file_unittest.cc
diff --git a/net/disk_cache/simple/simple_index_file_unittest.cc b/net/disk_cache/simple/simple_index_file_unittest.cc
index ef7c26d8e7d0632efb858e9b40151e968dd21250..17aa595bba98e949b90195ba4ce8bdc188ddd02f 100644
--- a/net/disk_cache/simple/simple_index_file_unittest.cc
+++ b/net/disk_cache/simple/simple_index_file_unittest.cc
@@ -178,13 +178,13 @@ TEST_F(SimpleIndexFileTest, LegacyIsIndexFileStale) {
 
   const base::Time past_time = base::Time::Now() -
       base::TimeDelta::FromSeconds(10);
-  EXPECT_TRUE(file_util::TouchFile(index_path, past_time, past_time));
-  EXPECT_TRUE(file_util::TouchFile(cache_path, past_time, past_time));
+  EXPECT_TRUE(base::TouchFile(index_path, past_time, past_time));
+  EXPECT_TRUE(base::TouchFile(cache_path, past_time, past_time));
   ASSERT_TRUE(simple_util::GetMTime(cache_path, &cache_mtime));
   EXPECT_FALSE(
       WrappedSimpleIndexFile::LegacyIsIndexFileStale(cache_mtime, index_path));
   const base::Time even_older = past_time - base::TimeDelta::FromSeconds(10);
-  EXPECT_TRUE(file_util::TouchFile(index_path, even_older, even_older));
+  EXPECT_TRUE(base::TouchFile(index_path, even_older, even_older));
   EXPECT_TRUE(
       WrappedSimpleIndexFile::LegacyIsIndexFileStale(cache_mtime, index_path));
 }