Convert BlockFiles to use FilePath instead of wstring.

net/tools/dump_cache/dump_files.cc

Index: net/tools/dump_cache/dump_files.cc
diff --git a/net/tools/dump_cache/dump_files.cc b/net/tools/dump_cache/dump_files.cc
index 2fcf7a4fdcbe2ba0ec244d6d1487883a4326fc2b..bfaa9d19092fd0597ebab2c9ff23683caea93366 100644
--- a/net/tools/dump_cache/dump_files.cc
+++ b/net/tools/dump_cache/dump_files.cc
@@ -9,6 +9,7 @@
 #include <stdio.h>
 #include <string>
 
+#include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/message_loop.h"
 #include "net/base/file_stream.h"
@@ -106,7 +107,9 @@ void DumpBlockHeader(const std::wstring& name) {
 class CacheDumper {
  public:
   explicit CacheDumper(const std::wstring& path)
-      : path_(path), block_files_(path), index_(NULL) {}
+      : path_(path),
+        block_files_(FilePath::FromWStringHack(path)),
+        index_(NULL) {}
 
   bool Init();