Add policies to control the disk cache size.

chrome/browser/browser_process_impl.cc

Index: chrome/browser/browser_process_impl.cc
diff --git a/chrome/browser/browser_process_impl.cc b/chrome/browser/browser_process_impl.cc
index baf12d06e42766d73f9db900a15f3543023229b5..4f231accf0142ed7350ce6b481f115d61d67574b 100644
--- a/chrome/browser/browser_process_impl.cc
+++ b/chrome/browser/browser_process_impl.cc
@@ -936,10 +936,6 @@ void BrowserProcessImpl::CreateLocalState() {
                                    local_state_.get(), NULL);
   plugin_finder_disabled_pref_.MoveToThread(BrowserThread::IO);
 
-  // Initialize the disk cache location policy. This policy is not hot update-
-  // able so we need to have it when initializing the profiles.
-  local_state_->RegisterFilePathPref(prefs::kDiskCacheDir, FilePath());
-
   // Another policy that needs to be defined before the net subsystem is
   // initialized is MaxConnectionsPerProxy so we do it here.
   local_state_->RegisterIntegerPref(prefs::kMaxConnectionsPerProxy,