Added CreateTemporaryFileName that takes a FilePath argument.

base/file_util_unittest.cc

Index: base/file_util_unittest.cc
===================================================================
--- base/file_util_unittest.cc	(revision 5112)
+++ base/file_util_unittest.cc	(working copy)
@@ -689,14 +689,14 @@
 
 TEST_F(FileUtilTest, CreateTemporaryFileNameTest) {
   std::wstring temp_file;
-  file_util::CreateTemporaryFileName(&temp_file);
+  ASSERT_TRUE(file_util::CreateTemporaryFileName(&temp_file));
   EXPECT_TRUE(file_util::PathExists(temp_file));
   EXPECT_TRUE(file_util::Delete(temp_file, false));
 }
 
 TEST_F(FileUtilTest, CreateNewTempDirectoryTest) {
   std::wstring temp_dir;
-  file_util::CreateNewTempDirectory(std::wstring(), &temp_dir);
+  ASSERT_TRUE(file_util::CreateNewTempDirectory(std::wstring(), &temp_dir));
   EXPECT_TRUE(file_util::PathExists(temp_dir));
   EXPECT_TRUE(file_util::Delete(temp_dir, false));
 }