Decreased num alerts in history per page to 5 to avoid exceeding memory and response limit

R=machenbach@chromium.org,ojan@chromium.org
BUG=416182

Review URL: https://codereview.chromium.org/657533002

git-svn-id: svn://svn.chromium.org/blink/trunk@183738 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Tools/GardeningServer/alerts.py

@@ -112,7 +112,7 @@ class AlertsHandler(webapp2.RequestHandler):
 
 
 class AlertsHistory(webapp2.RequestHandler):
-    MAX_LIMIT_PER_PAGE = 50
+    MAX_LIMIT_PER_PAGE = 5
 
     def get(self):
         alerts_query = AlertsJSON.query().order(-AlertsJSON.date)