Disable newly added jetstream2 benchmark on pixel 2 bots

This has been consistently failing since the benchmark got added.

TBR=crouleau@chromium.org
CC=​hypan@google.com
NOTRY=true

Bug: 1002936
Change-Id: Iec273d65eb904991837566e02e146e3327392b34
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1797694
Commit-Queue: oysteine <oysteine@chromium.org>
Reviewed-by: oysteine <oysteine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695644}

tools/perf/expectations.config

@@ -127,6 +127,9 @@ crbug.com/894147 [ android-nexus-5x ] blink_perf.svg/SierpinskiCarpet.html [ Ski
 # Benchmark: jetstream
 crbug.com/830600 [ android-nexus-5x android-webview ] jetstream/http://browserbench.org/JetStream/ [ Skip ]
 
+# Benchmark: jetstream2
+crbug.com/1002936 [ android-pixel-2 ] jetstream2/http://browserbench.org/JetStream/ [ Skip ]
+
 # Benchmark: loading.desktop
 crbug.com/723783 [ win ] loading.desktop/Orange_cold [ Skip ]
 crbug.com/723783 [ win ] loading.desktop/Orange_warm [ Skip ]