[tools/perf] Dropping some redundant expectations.config entries.

The 'newtab' and 'omnibox' stories aren't run against Android_Webview
because they don't make sense in that context. Since those stories
don't run against Android_Webview we don't need entries in
expectations.config to disable those stories on that platform.

Bug: 867568
Change-Id: Ifcd38f0bc5ace5fddc0d883e24b89b06d1f84ef6
Reviewed-on: https://chromium-review.googlesource.com/c/1392734
Commit-Queue: Tom McKee <tommckee@chromium.org>
Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619706}

tools/perf/expectations.config

@@ -290,7 +290,6 @@ crbug.com/899887 [ Linux ] system_health.memory_desktop/browse:social:facebook_i
 crbug.com/787001 [ Android_Webview ] system_health.memory_mobile/load:media:soundcloud [ Skip ]
 crbug.com/914390 [ Android_Webview Nexus_5 ] system_health.memory_mobile/browse:chrome:newtab [ Skip ]
 crbug.com/714650 [ Android ] system_health.memory_mobile/browse:news:globo [ Skip ]
-[ Android_Webview ] system_health.memory_mobile/browse:chrome:omnibox [ Skip ]
 crbug.com/819552 [ Nexus_5X ] system_health.memory_mobile/browse:chrome:omnibox [ Skip ]
 crbug.com/867853 [ Nexus_5X ] system_health.memory_mobile/browse:chrome:newtab [ Skip ]
 crbug.com/657433 [ Android ] system_health.memory_mobile/load:tools:gmail [ Skip ]
@@ -371,8 +370,6 @@ crbug.com/906654 [ All ] v8.browsing_desktop-future/browse:tech:discourse_infini
 crbug.com/714650 [ Android ] v8.browsing_mobile/browse:news:globo [ Skip ]
 crbug.com/767970 [ Android ] v8.browsing_mobile/browse:shopping:flipkart [ Skip ]
 crbug.com/708300 [ Android ] v8.browsing_mobile/browse:shopping:flipkart [ Skip ]
-[ Android_Webview ] v8.browsing_mobile/browse:chrome:omnibox [ Skip ]
-[ Android_Webview ] v8.browsing_mobile/browse:chrome:newtab [ Skip ]
 crbug.com/815175 [ Nexus_5 ] v8.browsing_mobile/browse:chrome:newtab [ Skip ]
 crbug.com/910207 [ Nexus_5X ] v8.browsing_mobile/browse:chrome:newtab [ Skip ]
 crbug.com/853212 [ Android_Webview ] v8.browsing_mobile/browse:media:youtube [ Skip ]
@@ -385,8 +382,6 @@ crbug.com/901967 [ Nexus6_Webview ] v8.browsing_mobile/browse:news:toi [ Skip ]
 crbug.com/714650 [ Android ] v8.browsing_mobile-future/browse:news:globo [ Skip ]
 crbug.com/767970 [ Android ] v8.browsing_mobile-future/browse:shopping:flipkart [ Skip ]
 crbug.com/708300 [ Android ] v8.browsing_mobile-future/browse:shopping:flipkart [ Skip ]
-[ Android_Webview ] v8.browsing_mobile-future/browse:chrome:omnibox [ Skip ]
-[ Android_Webview ] v8.browsing_mobile-future/browse:chrome:newtab [ Skip ]
 crbug.com/803465 [ Nexus_5 ] v8.browsing_mobile-future/browse:chrome:newtab [ Skip ]
 crbug.com/910207 [ Nexus_5X ] v8.browsing_mobile-future/browse:chrome:newtab [ Skip ]
 crbug.com/799080 [ Nexus_5X Android_Webview ] v8.browsing_mobile-future/browse:social:facebook [ Skip ]