Only set File::[tracing_]path_ when file tracing is enabled.

base/files/file_win.cc

Index: base/files/file_win.cc
diff --git a/base/files/file_win.cc b/base/files/file_win.cc
index 97928522f106c3c16c58ed0e03b62901da3416a8..ce38d0b0e2af276a080105374d1d0fa5fc10c282 100644
--- a/base/files/file_win.cc
+++ b/base/files/file_win.cc
@@ -308,7 +308,7 @@ File::Error File::OSErrorToFileError(DWORD last_error) {
   }
 }
 
-void File::DoInitialize(uint32 flags) {
+void File::DoInitialize(const FilePath& path, uint32 flags) {
   ThreadRestrictions::AssertIOAllowed();
   DCHECK(!IsValid());
 
@@ -376,7 +376,7 @@ void File::DoInitialize(uint32 flags) {
   if (flags & FLAG_BACKUP_SEMANTICS)
     create_flags |= FILE_FLAG_BACKUP_SEMANTICS;
 
-  file_.Set(CreateFile(path_.value().c_str(), access, sharing, NULL,
+  file_.Set(CreateFile(path.value().c_str(), access, sharing, NULL,
                        disposition, create_flags, NULL));
 
   if (file_.IsValid()) {