Convert some tools to use FilePaths for file names.

base/file_path.h

Index: base/file_path.h
diff --git a/base/file_path.h b/base/file_path.h
index 0efe1a14407bc63e655415ae916f635ed0d2e589..46a30609508869b036419519219bd2449a6b329d 100644
--- a/base/file_path.h
+++ b/base/file_path.h
@@ -355,11 +355,14 @@ class FilePath {
   StringType path_;
 };
 
-// Macros for string literal initialization of FilePath::CharType[].
+// Macros for string literal initialization of FilePath::CharType[], and for
+// using a FilePath::CharType[] in a printf-style format string.
 #if defined(OS_POSIX)
 #define FILE_PATH_LITERAL(x) x
+#define PRFilePath "s"
 #elif defined(OS_WIN)
 #define FILE_PATH_LITERAL(x) L ## x
+#define PRFilePath "ls"
 #endif  // OS_WIN
 
 // Provide a hash function so that hash_sets and maps can contain FilePath