Move WriteFile and WriteFileDescriptor from file_util to base namespace.

chrome/installer/util/self_cleaning_temp_dir_unittest.cc

Index: chrome/installer/util/self_cleaning_temp_dir_unittest.cc
diff --git a/chrome/installer/util/self_cleaning_temp_dir_unittest.cc b/chrome/installer/util/self_cleaning_temp_dir_unittest.cc
index 7366211facf287df769cdb3d04896086b98a35ae..9ff34254e02157f03fc630316b912555da29bbbf 100644
--- a/chrome/installer/util/self_cleaning_temp_dir_unittest.cc
+++ b/chrome/installer/util/self_cleaning_temp_dir_unittest.cc
@@ -161,8 +161,8 @@ TEST_F(SelfCleaningTempDirTest, LeaveUsedOnDestroy) {
     EXPECT_TRUE(base::DirectoryExists(temp_dir.path()));
     // Drop a file somewhere.
     EXPECT_EQ(arraysize(kHiHon) - 1,
-              file_util::WriteFile(parent_temp_dir.Append(GetRandomFilename()),
-                                   kHiHon, arraysize(kHiHon) - 1));
+              base::WriteFile(parent_temp_dir.Append(GetRandomFilename()),
+                              kHiHon, arraysize(kHiHon) - 1));
   }
   EXPECT_FALSE(base::DirectoryExists(parent_temp_dir.Append(L"Three")));
   EXPECT_TRUE(base::DirectoryExists(parent_temp_dir));