Convert some tools to use FilePaths for file names.

chrome/tools/convert_dict/convert_dict_unittest.cc

Index: chrome/tools/convert_dict/convert_dict_unittest.cc
diff --git a/chrome/tools/convert_dict/convert_dict_unittest.cc b/chrome/tools/convert_dict/convert_dict_unittest.cc
index 525da05c56ac7f0d800b716035676e1689c4794b..25568a12f495d4b3a0d80bad6cc4b79bdd5550d1 100644
--- a/chrome/tools/convert_dict/convert_dict_unittest.cc
+++ b/chrome/tools/convert_dict/convert_dict_unittest.cc
@@ -90,17 +90,10 @@ void RunDictionaryTest(const char* codepage,
   {
     // Read the above affix file with AffReader and read the dictionary file
     // with DicReader, respectively.
-#if defined(OS_WIN)
-    std::string aff_path = WideToUTF8(aff_file.value());
-    std::string dic_path = WideToUTF8(dic_file.value());
-#else
-    std::string aff_path = aff_file.value();
-    std::string dic_path = dic_file.value();
-#endif
-    convert_dict::AffReader aff_reader(aff_path);
+    convert_dict::AffReader aff_reader(aff_file);
     EXPECT_TRUE(aff_reader.Read());
 
-    convert_dict::DicReader dic_reader(dic_path);
+    convert_dict::DicReader dic_reader(dic_file);
     EXPECT_TRUE(dic_reader.Read(&aff_reader));
 
     // Verify this DicReader includes all the input words.