Mark http/tests/devtools/console-resource-errors.js as flaky

TBR=luoe@chromium.org
NOTRY=true

Bug: 859064
Change-Id: I2c8478e61a3680d2a170afa70bd5e689e7e2e97e
Reviewed-on: https://chromium-review.googlesource.com/1125657Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572510}

third_party/WebKit/LayoutTests/TestExpectations

@@ -4731,7 +4731,7 @@ crbug.com/856601 [ Linux ] virtual/feature-policy-permissions/external/wpt/media
 crbug.com/857520 [ Mac Win ] external/wpt/accelerometer/Accelerometer-iframe-access.https.html [ Failure ]
 
 # Sheriff 2018-06-29
-crbug.com/859064 [ Linux Win10 Mac10.13 ] http/tests/devtools/console-resource-errors.js [ Failure ]
+crbug.com/859064 http/tests/devtools/console-resource-errors.js [ Pass Failure ]
 crbug.com/859169 [ Win7 ] http/tests/devtools/layers/layer-scroll-rects-get.js [ Failure Pass ]
 crbug.com/859270 [ Mac10.12 ] external/wpt/gyroscope/Gyroscope-iframe-access.https.html [ Timeout ]