Move directory creation functions to base namespace.

chrome/installer/util/duplicate_tree_detector_unittest.cc

Index: chrome/installer/util/duplicate_tree_detector_unittest.cc
diff --git a/chrome/installer/util/duplicate_tree_detector_unittest.cc b/chrome/installer/util/duplicate_tree_detector_unittest.cc
index 6a97d840084efaf7eb709f11058a2db74b1de435..4b636ee44ca0576dc222125287d44437022f43ca 100644
--- a/chrome/installer/util/duplicate_tree_detector_unittest.cc
+++ b/chrome/installer/util/duplicate_tree_detector_unittest.cc
@@ -39,7 +39,7 @@ class DuplicateTreeDetectorTest : public testing::Test {
                                      const base::FilePath& second_root) {
     base::FilePath d1(first_root);
     d1 = d1.AppendASCII("D1");
-    file_util::CreateDirectory(d1);
+    base::CreateDirectory(d1);
     ASSERT_TRUE(base::PathExists(d1));
 
     base::FilePath f1(d1);
@@ -49,7 +49,7 @@ class DuplicateTreeDetectorTest : public testing::Test {
 
     base::FilePath d2(d1);
     d2 = d2.AppendASCII("D2");
-    file_util::CreateDirectory(d2);
+    base::CreateDirectory(d2);
     ASSERT_TRUE(base::PathExists(d2));
 
     base::FilePath f2(d2);