[tools/perf] Re-enable benchmarks in Pixel_2 bots

Underlying issue in crbug.com/962918 has been fixed, let's try
re-enabling them now.

NOTRY=true
TBR=crouleau@chromium.org

Bug: 966630
Bug: 966619
Bug: 966631
Change-Id: Ic59ce1d63d6c4b796420fec23002dafa853b35cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1636195Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
Commit-Queue: Juan Antonio Navarro Pérez <perezju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664705}

tools/perf/expectations.config

@@ -192,9 +192,6 @@ crbug.com/865400 [ Pixel2_Webview ] loading.mobile/VoiceMemos_cold_3g [ Skip ]
 crbug.com/919191 [ Nexus5X_Webview ] loading.mobile/OLX_3g [ Skip ]
 crbug.com/966624 [ Pixel_2 ] loading.mobile/* [ Skip ] # mass disabling to set up the bot for pixel 2
 
-# Benchmark: memory.top_10_mobile
-crbug.com/966630 [ Pixel_2 ] memory.top_10_mobile/* [ Skip ] # mass disabling to set up the bot for pixel 2
-
 # Benchmark: oilpan_gc_times.key_silk_cases
 crbug.com/446332 [ All ] oilpan_gc_times.key_silk_cases/slide_drawer [ Skip ]
 crbug.com/507865 [ All ] oilpan_gc_times.key_silk_cases/polymer_topeka [ Skip ]
@@ -207,9 +204,6 @@ crbug.com/756119 [ All ] oilpan_gc_times.sync_scroll.key_mobile_sites_smooth/dig
 crbug.com/755556 [ Mac ] rendering.desktop/mix_blend_mode_animation_difference [ Skip ]
 crbug.com/755556 [ Mac ] rendering.desktop/mix_blend_mode_animation_hue [ Skip ]
 
-# Benchmark: media.mobile
-crbug.com/966619 [ Pixel_2 ] media.mobile/* [ Skip ] # mass disabling to set up the bot for pixel 2
-
 # Benchmark: rendering.mobile
 crbug.com/785485 [ Android_Webview ] rendering.mobile/kevs_3d [ Skip ]
 crbug.com/785286 [ Android_Webview ] rendering.mobile/smash_cat [ Skip ]
@@ -250,7 +244,6 @@ crbug.com/924400 [ Nexus6_Webview ] rendering.mobile/canvas_animation_no_clear [
 crbug.com/949366 [ Nexus5X_Webview ] rendering.mobile/google_news_mobile_2018 [ Skip ]
 crbug.com/954948 [ Android_Webview ] rendering.mobile/cnn_mobile_pinch_2018 [ Skip ]
 crbug.com/966637 [ Pixel2_Webview ] rendering.mobile/google_news_mobile_2018 [ Skip ]
-crbug.com/966631 [ Pixel_2 ] rendering.mobile/* [ Skip ] # mass disabling to set up the bot for pixel 2
 crbug.com/967809 [ Android_Webview ] rendering.mobile/microsoft_video_city [ Skip ]
 
 # Benchmark: rasterize_and_record_micro.top_25