Base unit tests: Small fix for two incorrect utility

base/file_util_unittest.cc

Index: base/file_util_unittest.cc
===================================================================
--- base/file_util_unittest.cc	(revision 79303)
+++ base/file_util_unittest.cc	(working copy)
@@ -162,7 +162,7 @@
 // Simple function to dump some text into a new file.
 void CreateTextFile(const FilePath& filename,
                     const std::wstring& contents) {
-  std::ofstream file;
+  std::wofstream file;
   file.open(filename.value().c_str());
   ASSERT_TRUE(file.is_open());
   file << contents;
@@ -175,7 +175,7 @@
   std::wifstream file;
   file.open(filename.value().c_str());
   EXPECT_TRUE(file.is_open());
-  file.getline(contents, 64);
+  file.getline(contents, arraysize(contents));
   file.close();
   return std::wstring(contents);
 }