Step 2 in porting disk cache to using FilePath.

net/disk_cache/file.h

Index: net/disk_cache/file.h
diff --git a/net/disk_cache/file.h b/net/disk_cache/file.h
index 3c167dbb76e0e3e691e9fe9e0667cacf74ddedee..76c2f7940bbd32ccf72216b9b09874d1ac3d39ad 100644
--- a/net/disk_cache/file.h
+++ b/net/disk_cache/file.h
@@ -12,6 +12,8 @@
 #include "base/platform_file.h"
 #include "base/ref_counted.h"
 
+class FilePath;
+
 namespace disk_cache {
 
 // This interface is used to support asynchronous ReadData and WriteData calls.
@@ -39,7 +41,7 @@ class File : public base::RefCounted<File> {
 
   // Initializes the object to point to a given file. The file must aready exist
   // on disk, and allow shared read and write.
-  bool Init(const std::wstring& name);
+  bool Init(const FilePath& name);
 
   // Returns the handle or file descriptor.
   base::PlatformFile platform_file() const;