Move PathExists to base namespace.

net/disk_cache/cache_util.cc

Index: net/disk_cache/cache_util.cc
diff --git a/net/disk_cache/cache_util.cc b/net/disk_cache/cache_util.cc
index 0504559c66742bd08d7a3d5d6460a4c607499c09..24575534ba86d6471d39144895eb76cdd8184de6 100644
--- a/net/disk_cache/cache_util.cc
+++ b/net/disk_cache/cache_util.cc
@@ -41,7 +41,7 @@ base::FilePath GetTempCacheName(const base::FilePath& path,
   // We'll attempt to have up to kMaxOldFolders folders for deletion.
   for (int i = 0; i < kMaxOldFolders; i++) {
     base::FilePath to_delete = GetPrefixedName(path, name, i);
-    if (!file_util::PathExists(to_delete))
+    if (!base::PathExists(to_delete))
       return to_delete;
   }
   return base::FilePath();