Switch to TimeDelta interfaces in chrome automation test infrastructure.

chrome/test/automation/browser_proxy.h

Index: chrome/test/automation/browser_proxy.h
diff --git a/chrome/test/automation/browser_proxy.h b/chrome/test/automation/browser_proxy.h
index d764e499f2d20325577c01765b7fe85e711cb981..ca0451af3b6e80f58abe4a627852477bfa21287e 100644
--- a/chrome/test/automation/browser_proxy.h
+++ b/chrome/test/automation/browser_proxy.h
@@ -106,7 +106,9 @@ class BrowserProxy : public AutomationResourceProxy {
   // Block the thread until the specified tab is the active tab.
   // |wait_timeout| is the timeout, in milliseconds, for waiting.
   // Returns false if the tab does not become active.
-  bool WaitForTabToBecomeActive(int tab, int wait_timeout) WARN_UNUSED_RESULT;
+  bool WaitForTabToBecomeActive(
+      int tab,
+      base::TimeDelta wait_timeout) WARN_UNUSED_RESULT;
 
   // Opens the FindInPage box. Note: If you just want to search within a tab
   // you don't need to call this function, just use FindInPage(...) directly.
@@ -180,7 +182,7 @@ class BrowserProxy : public AutomationResourceProxy {
   // the delay that WaitForInitialLoads waits for), and a list of all
   // finished timestamps into |stop_times|. Returns true on success.
   bool GetInitialLoadTimes(
-      int timeout_ms,
+      base::TimeDelta timeout,
       float* min_start_time,
       float* max_stop_time,
       std::vector<float>* stop_times);