Switch to TimeDelta interfaces in chrome automation test infrastructure.

chrome/test/automation/automation_proxy.h

Index: chrome/test/automation/automation_proxy.h
diff --git a/chrome/test/automation/automation_proxy.h b/chrome/test/automation/automation_proxy.h
index 21823a5f4688aca464f843f34bfd46fc91a9b640..6a42c9f41d505e706a9bf0cf5f38e30074424596 100644
--- a/chrome/test/automation/automation_proxy.h
+++ b/chrome/test/automation/automation_proxy.h
@@ -54,7 +54,7 @@ class AutomationMessageSender : public IPC::Sender {
 // a running instance of the app.
 class AutomationProxy : public IPC::Listener, public AutomationMessageSender {
  public:
-  AutomationProxy(int action_timeout_ms, bool disconnect_on_failure);
+  AutomationProxy(base::TimeDelta action_timeout, bool disconnect_on_failure);
   virtual ~AutomationProxy();
 
   // Creates a previously unused channel id.
@@ -192,15 +192,16 @@ class AutomationProxy : public IPC::Listener, public AutomationMessageSender {
       gfx::NativeWindow* external_tab_container,
       gfx::NativeWindow* tab);
 
-  int action_timeout_ms() const {
-    return static_cast<int>(action_timeout_.InMilliseconds());
+  base::TimeDelta action_timeout() const {
+    return action_timeout_;
   }
 
   // Sets the timeout for subsequent automation calls.
-  void set_action_timeout_ms(int timeout_ms) {
-    DCHECK(timeout_ms <= 10 * 60 * 1000 ) << "10+ min of automation timeout "
-        "can make the test hang and be killed by buildbot";
-    action_timeout_ = base::TimeDelta::FromMilliseconds(timeout_ms);
+  void set_action_timeout(base::TimeDelta timeout) {
+    DCHECK(timeout <= base::TimeDelta::FromMinutes(10))
+        << "10+ min of automation timeout "
+           "can make the test hang and be killed by buildbot";
+    action_timeout_ = timeout;
   }
 
   // Returns the server version of the server connected. You may only call this