Revert 64960 - Turn on file access checks on Win....

net/proxy/proxy_config_service_win.cc

Index: net/proxy/proxy_config_service_win.cc
===================================================================
--- net/proxy/proxy_config_service_win.cc	(revision 64973)
+++ net/proxy/proxy_config_service_win.cc	(working copy)
@@ -12,7 +12,6 @@
 #include "base/string_tokenizer.h"
 #include "base/string_util.h"
 #include "base/stl_util-inl.h"
-#include "base/thread_restrictions.h"
 #include "base/win/registry.h"
 #include "net/base/net_errors.h"
 #include "net/proxy/proxy_config.h"
@@ -73,9 +72,6 @@
 }
 
 ProxyConfigServiceWin::~ProxyConfigServiceWin() {
-  // The registry functions below will end up going to disk.  Do this on another
-  // thread to avoid slowing the IO thread.  http://crbug.com/61453
-  base::ThreadRestrictions::ScopedAllowIO allow_io;
   STLDeleteElements(&keys_to_watch_);
 }
 
@@ -91,10 +87,6 @@
   if (!keys_to_watch_.empty())
     return;  // Already initialized.
 
-  // The registry functions below will end up going to disk.  Do this on another
-  // thread to avoid slowing the IO thread.  http://crbug.com/61453
-  base::ThreadRestrictions::ScopedAllowIO allow_io;
-
   // There are a number of different places where proxy settings can live
   // in the registry. In some cases it appears in a binary value, in other
   // cases string values. Furthermore winhttp and wininet appear to have