Switch to TimeDelta interfaces for process waiting functions in net and ipc.

net/proxy/dhcp_proxy_script_fetcher_win.cc

Index: net/proxy/dhcp_proxy_script_fetcher_win.cc
diff --git a/net/proxy/dhcp_proxy_script_fetcher_win.cc b/net/proxy/dhcp_proxy_script_fetcher_win.cc
index ab24aa34fe0e7baa4a889cfb9d8a4c9ab7c9bd9c..d7392fefbdbd95e9cc3ce0177cc0f682be75f771 100644
--- a/net/proxy/dhcp_proxy_script_fetcher_win.cc
+++ b/net/proxy/dhcp_proxy_script_fetcher_win.cc
@@ -194,8 +194,7 @@ void DhcpProxyScriptFetcherWin::OnFetcherDone(int result) {
   if (state_ == STATE_NO_RESULTS) {
     state_ = STATE_SOME_RESULTS;
     wait_timer_.Start(FROM_HERE,
-        base::TimeDelta::FromMilliseconds(ImplGetMaxWaitMs()),
-        this, &DhcpProxyScriptFetcherWin::OnWaitTimer);
+        ImplGetMaxWait(), this, &DhcpProxyScriptFetcherWin::OnWaitTimer);
   }
 }
 
@@ -283,8 +282,8 @@ DhcpProxyScriptFetcherWin::AdapterQuery*
   return new AdapterQuery();
 }
 
-int DhcpProxyScriptFetcherWin::ImplGetMaxWaitMs() {
-  return kMaxWaitAfterFirstResultMs;
+base::TimeDelta DhcpProxyScriptFetcherWin::ImplGetMaxWait() {
+  return base::TimeDelta::FromMilliseconds(kMaxWaitAfterFirstResultMs);
 }
 
 bool DhcpProxyScriptFetcherWin::GetCandidateAdapterNames(