Move more file_util functions to base namespace.

chrome/browser/safe_browsing/prefix_set.cc

Index: chrome/browser/safe_browsing/prefix_set.cc
diff --git a/chrome/browser/safe_browsing/prefix_set.cc b/chrome/browser/safe_browsing/prefix_set.cc
index e3100c7203df7bc7e6091b21b704e5f9d67fa74a..4a1ff73685fc8557a3127d1a3b4edf05426050b8 100644
--- a/chrome/browser/safe_browsing/prefix_set.cc
+++ b/chrome/browser/safe_browsing/prefix_set.cc
@@ -160,7 +160,7 @@ PrefixSet* PrefixSet::LoadFile(const base::FilePath& filter_name) {
   if (size_64 < static_cast<int64>(sizeof(FileHeader) + sizeof(MD5Digest)))
     return NULL;
 
-  file_util::ScopedFILE file(file_util::OpenFile(filter_name, "rb"));
+  file_util::ScopedFILE file(base::OpenFile(filter_name, "rb"));
   if (!file.get())
     return NULL;
 
@@ -243,7 +243,7 @@ bool PrefixSet::WriteFile(const base::FilePath& filter_name) const {
     return false;
   }
 
-  file_util::ScopedFILE file(file_util::OpenFile(filter_name, "wb"));
+  file_util::ScopedFILE file(base::OpenFile(filter_name, "wb"));
   if (!file.get())
     return false;