Move more file_util functions to base namespace.

net/disk_cache/cache_util_unittest.cc

Index: net/disk_cache/cache_util_unittest.cc
diff --git a/net/disk_cache/cache_util_unittest.cc b/net/disk_cache/cache_util_unittest.cc
index b86290f757f8d1be4d61d8628498e02c7a0c9b3e..3a05196828e6212e11352e58661f693410d45b50 100644
--- a/net/disk_cache/cache_util_unittest.cc
+++ b/net/disk_cache/cache_util_unittest.cc
@@ -21,16 +21,16 @@ class CacheUtilTest : public PlatformTest {
     dir1_ = base::FilePath(cache_dir_.Append(FILE_PATH_LITERAL("dir01")));
     file3_ = base::FilePath(dir1_.Append(FILE_PATH_LITERAL("file03")));
     ASSERT_TRUE(base::CreateDirectory(cache_dir_));
-    FILE *fp = file_util::OpenFile(file1_, "w");
+    FILE *fp = base::OpenFile(file1_, "w");
     ASSERT_TRUE(fp != NULL);
-    file_util::CloseFile(fp);
-    fp = file_util::OpenFile(file2_, "w");
+    base::CloseFile(fp);
+    fp = base::OpenFile(file2_, "w");
     ASSERT_TRUE(fp != NULL);
-    file_util::CloseFile(fp);
+    base::CloseFile(fp);
     ASSERT_TRUE(base::CreateDirectory(dir1_));
-    fp = file_util::OpenFile(file3_, "w");
+    fp = base::OpenFile(file3_, "w");
     ASSERT_TRUE(fp != NULL);
-    file_util::CloseFile(fp);
+    base::CloseFile(fp);
     dest_dir_ = tmp_dir_.path().Append(FILE_PATH_LITERAL("old_Cache_001"));
     dest_file1_ = base::FilePath(dest_dir_.Append(FILE_PATH_LITERAL("file01")));
     dest_file2_ =