Disabling v8.browsing_mobile/browse:news:cnn on Nexus5.

TBR=charliea@chromium.org

NOTRY=true

Bug: 815175
Change-Id: I845756bd9ead74657ccc80a8a3568dc615ed3bb6
Reviewed-on: https://chromium-review.googlesource.com/934627
Commit-Queue: Emily Hanley <eyaich@chromium.org>
Reviewed-by: Emily Hanley <eyaich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#538794}

tools/perf/expectations.config

@@ -330,7 +330,8 @@ crbug.com/803870 [ Cherry_Mobile_Android_One ] v8.browsing_mobile/browse:media:y
 crbug.com/767970 [ Cherry_Mobile_Android_One ] v8.browsing_mobile/browse:news:cnn [ Skip ]
 [ Android_Webview ] v8.browsing_mobile/browse:chrome:omnibox [ Skip ]
 [ Android_Webview ] v8.browsing_mobile/browse:chrome:newtab [ Skip ]
-crbug.com/803465 [ Nexus_5 ] v8.browsing_mobile/browse:chrome:newtab [ Skip ]
+crbug.com/815175 [ Nexus_5 ] v8.browsing_mobile/browse:chrome:newtab [ Skip ]
+crbug.com/714650 [ Nexus_5 ] v8.browsing_mobile/browse:news:cnn [ Skip ]
 crbug.com/799080 [ Nexus_7 ] v8.browsing_mobile-future/browse:news:cnn [ Skip ]
 
 # Benchmark: v8.browsing_mobile-future