Increase web page replay startup timeout from 10 to 30 seconds.

This is a continuation of r200100 which did reduce the flakiness of our
tests.

BUG=237917
TEST=None
NOTRY=True

Review URL: https://chromiumcodereview.appspot.com/17155016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@207863 0039d316-1c4b-4281-b951-d872f2087c98

chrome/test/functional/webpagereplay.py

@@ -127,7 +127,7 @@ class ReplayServer(object):
 
   def IsStarted(self):
     """Checks to see if the server is up and running."""
-    for _ in range(10):
+    for _ in range(30):
       if self.replay_process.poll() is not None:
         # The process has exited.
         break