Remove less important system health mobile stories.

tools/perf/page_sets/system_health/browsing_stories.py

Index: tools/perf/page_sets/system_health/browsing_stories.py
diff --git a/tools/perf/page_sets/system_health/browsing_stories.py b/tools/perf/page_sets/system_health/browsing_stories.py
index e24b1e667f14c5161214575fdd2b398b088aa281..baea0dd32e7fd49a8842a6a78f1aaa792dee1139 100644
--- a/tools/perf/page_sets/system_health/browsing_stories.py
+++ b/tools/perf/page_sets/system_health/browsing_stories.py
@@ -146,15 +146,6 @@ class InstagramMobileStory(_ArticleBrowsingStory):
     action_runner.NavigateBack()
 
 
-class FlipboardMobileStory(_ArticleBrowsingStory):
-  NAME = 'browse:news:flipboard'
-  URL = 'https://flipboard.com/explore'
-  IS_SINGLE_PAGE_APP = True
-  ITEM_SELECTOR = '.grad-top'
-  ITEM_SCROLL_REPEAT = 4
-  SUPPORTED_PLATFORMS = platforms.MOBILE_ONLY
-
-
 class FlipboardDesktopStory(_ArticleBrowsingStory):
   NAME = 'browse:news:flipboard'
   URL = 'https://flipboard.com/explore'
@@ -165,20 +156,11 @@ class FlipboardDesktopStory(_ArticleBrowsingStory):
 
 # crbug.com/657665 for win and mac
 @decorators.Disabled('win', 'mac')
-class HackerNewsStory(_ArticleBrowsingStory):
+class HackerNewsDesktopStory(_ArticleBrowsingStory):
   NAME = 'browse:news:hackernews'
   URL = 'https://news.ycombinator.com'
   ITEM_SELECTOR = '.athing .title > a'
-
-
-class NytimesMobileStory(_ArticleBrowsingStory):
-  """The third top website in http://www.alexa.com/topsites/category/News"""
-  NAME = 'browse:news:nytimes'
-  URL = 'http://mobile.nytimes.com'
-  ITEM_SELECTOR = '.sfgAsset-link'
-  # Visiting more items causes OOM.
-  ITEMS_TO_VISIT = 2
-  SUPPORTED_PLATFORMS = platforms.MOBILE_ONLY
+  SUPPORTED_PLATFORMS = platforms.DESKTOP_ONLY
 
 
 class NytimesDesktopStory(_ArticleBrowsingStory):