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

R=rvargas@chromium.org
BUG=none
TEST=less |path_| cruft lying around

Review URL: https://codereview.chromium.org/1216183004

Cr-Commit-Position: refs/heads/master@{#337168}


CrOS-Libchrome-Original-Commit: fd5b108c82d56f6022dfbe62a023d1e81ff6f83b
diff --git a/base/files/file.cc b/base/files/file.cc
index 6dfeb91..47b9f88 100644
--- a/base/files/file.cc
+++ b/base/files/file.cc
@@ -52,7 +52,7 @@
 
 File::File(RValue other)
     : file_(other.object->TakePlatformFile()),
-      path_(other.object->path_),
+      tracing_path_(other.object->tracing_path_),
       error_details_(other.object->error_details()),
       created_(other.object->created()),
       async_(other.object->async_) {
@@ -76,7 +76,7 @@
   if (this != other.object) {
     Close();
     SetPlatformFile(other.object->TakePlatformFile());
-    path_ = other.object->path_;
+    tracing_path_ = other.object->tracing_path_;
     error_details_ = other.object->error_details();
     created_ = other.object->created();
     async_ = other.object->async_;
@@ -90,9 +90,10 @@
     error_details_ = FILE_ERROR_ACCESS_DENIED;
     return;
   }
-  path_ = path;
+  if (FileTracing::IsCategoryEnabled())
+    tracing_path_ = path;
   SCOPED_FILE_TRACE("Initialize");
-  DoInitialize(flags);
+  DoInitialize(path, flags);
 }
 #endif