Mark inspector-protocol/runtime/runtime-console-log-handle-navigate.js flaky

This test is really flaky. Findit suspects that it was caused by a v8
update. TBR owners for furthur investigation.

TBR=hablich@chromium.org
NOTRY=true

Bug: 898156
Change-Id: I69b3929f6b26772fba0b0a3ada8ea3aa3b807424
Reviewed-on: https://chromium-review.googlesource.com/c/1296319Reviewed-by: Yi Gu <yigu@chromium.org>
Commit-Queue: Yi Gu <yigu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601925}

third_party/WebKit/LayoutTests/TestExpectations

@@ -5457,3 +5457,6 @@ crbug.com/897775 [ Linux Mac Win ] external/wpt/performance-timeline/webtiming-r
 crbug.com/897849 [ Mac10.13 Debug ] accessibility/element-role-mapping-normal.html [ Pass Timeout ]
 crbug.com/897849 [ Mac10.13 Debug ] accessibility/table-header-column-row.html [ Pass Timeout ]
 crbug.com/897075 [ Win10 ] inspector-protocol/css/css-coverage-new-stylesheet.js [ Failure Pass ]
+
+#Sheriff 2018-10-23
+crbug.com/898156 [ Linux Mac Win ] inspector-protocol/runtime/runtime-console-log-handle-navigate.js [ Failure Pass ]