Move WriteFile and WriteFileDescriptor from file_util to base namespace.

net/disk_cache/backend_unittest.cc

Index: net/disk_cache/backend_unittest.cc
diff --git a/net/disk_cache/backend_unittest.cc b/net/disk_cache/backend_unittest.cc
index 35fdebc990ab5fbcb17c63d974733dfb5d4cf00e..68da572debb3697dda9f301952106f4617175671 100644
--- a/net/disk_cache/backend_unittest.cc
+++ b/net/disk_cache/backend_unittest.cc
@@ -482,7 +482,7 @@ TEST_F(DiskCacheBackendTest, ExternalFiles) {
   const int kSize = 50;
   scoped_refptr<net::IOBuffer> buffer1(new net::IOBuffer(kSize));
   CacheTestFillBuffer(buffer1->data(), kSize, false);
-  ASSERT_EQ(kSize, file_util::WriteFile(filename, buffer1->data(), kSize));
+  ASSERT_EQ(kSize, base::WriteFile(filename, buffer1->data(), kSize));
 
   // Now let's create a file with the cache.
   disk_cache::Entry* entry;
@@ -671,7 +671,7 @@ TEST_F(DiskCacheBackendTest, ShutdownWithPendingCreate_Fast) {
 TEST_F(DiskCacheTest, TruncatedIndex) {
   ASSERT_TRUE(CleanupCacheDir());
   base::FilePath index = cache_path_.AppendASCII("index");
-  ASSERT_EQ(5, file_util::WriteFile(index, "hello", 5));
+  ASSERT_EQ(5, base::WriteFile(index, "hello", 5));
 
   base::Thread cache_thread("CacheThread");
   ASSERT_TRUE(cache_thread.StartWithOptions(
@@ -3317,7 +3317,7 @@ TEST_F(DiskCacheBackendTest, SimpleCacheOpenBadFile) {
   header.initial_magic_number = GG_UINT64_C(0xbadf00d);
   EXPECT_EQ(
       implicit_cast<int>(sizeof(header)),
-      file_util::WriteFile(entry_file1_path, reinterpret_cast<char*>(&header),
+      base::WriteFile(entry_file1_path, reinterpret_cast<char*>(&header),
                            sizeof(header)));
   ASSERT_EQ(net::ERR_FAILED, OpenEntry(key, &entry));
 }