Remove Android Release (Pixel C) from GPU.FYI

BUG=723065, 624621
TBR=kbr@chromium.org, dpranke@chromium.org
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2890073002
Cr-Original-Commit-Position: refs/heads/master@{#473025}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 8564d2558144399265526b404d21ab589d2e8d92
diff --git a/mb_config.pyl b/mb_config.pyl
index ff6a9e5..c03427a 100644
--- a/mb_config.pyl
+++ b/mb_config.pyl
@@ -240,7 +240,6 @@
       'Android Release (Nexus 6)': 'android_release_trybot',
       'Android Release (Nexus 6P)': 'android_release_trybot_arm64',
       'Android Release (Nexus 9)': 'android_release_trybot_arm64',
-      'Android Release (Pixel C)': 'android_release_trybot_arm64',
       'Android Release (NVIDIA Shield TV)': 'android_release_trybot_arm64',
       'GPU Linux Builder (dbg)': 'gpu_fyi_tests_debug_trybot',
       'GPU Linux Builder': 'gpu_fyi_tests_release_trybot',