Increase timeout limit of loading articles for system_health's browse:news:nytimes story

Bug: 865247
Change-Id: I9913d1610ae0c8733e9839da3d885ac754fe5984
Reviewed-on: https://chromium-review.googlesource.com/1142598Reviewed-by: Annie Sullivan <sullivan@chromium.org>
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#576357}

tools/perf/page_sets/system_health/browsing_stories.py

@@ -172,6 +172,7 @@ class NytimesDesktopStory(_ArticleBrowsingStory):
   URL = 'http://www.nytimes.com'
   ITEM_SELECTOR = '.story-heading > a'
   SUPPORTED_PLATFORMS = platforms.DESKTOP_ONLY
+  COMPLETE_STATE_WAIT_TIMEOUT = 150  # crbug.com/865247
 
 
 # Desktop qq.com opens a news item in a separate tab, for which the back button