Switch to TimeDelta interfaces in chrome automation test infrastructure.

chrome/test/ppapi/ppapi_test.h

Index: chrome/test/ppapi/ppapi_test.h
diff --git a/chrome/test/ppapi/ppapi_test.h b/chrome/test/ppapi/ppapi_test.h
index 4e53f74dedbd462f46330abd31e5a2c10d3dba61..4c91097ea74b37dcd79e3ba3fd93b5e68097d27d 100644
--- a/chrome/test/ppapi/ppapi_test.h
+++ b/chrome/test/ppapi/ppapi_test.h
@@ -44,7 +44,7 @@ class PPAPITestBase : public InProcessBrowserTest {
   class TestFinishObserver : public content::NotificationObserver {
    public:
     TestFinishObserver(content::RenderViewHost* render_view_host,
-                       int timeout_s);
+                       base::TimeDelta timeout);
 
     bool WaitForFinish();
 
@@ -61,7 +61,7 @@ class PPAPITestBase : public InProcessBrowserTest {
 
     bool finished_;
     bool waiting_;
-    int timeout_s_;
+    base::TimeDelta timeout_;
     std::string result_;
     content::NotificationRegistrar registrar_;
     base::RepeatingTimer<TestFinishObserver> timer_;