CFI-icall: Add blacklist entry

I noticed some accessibility tests need to be blacklisted on Linux,
presumably they don't run on the Linux CFI bot by default.

Change-Id: Idd2bffd6dc16a24a64d70d466ffa50fbe106a5e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1888716
Auto-Submit: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Commit-Queue: Peter Collingbourne <pcc@chromium.org>
Reviewed-by: Peter Collingbourne <pcc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710843}

tools/cfi/blacklist.txt

@@ -166,6 +166,7 @@ src:*components/os_crypt/*
 src:*content/browser/accessibility/browser_accessibility_auralinux.cc
 src:*ui/accessibility/platform/ax_platform_node_auralinux.cc
 src:*ui/accessibility/platform/ax_platform_atk_hyperlink.cc
+src:*ui/accessibility/platform/ax_platform_node_auralinux_unittest.cc
 
 src:*chrome/browser/ui/zoom/chrome_zoom_level_prefs.cc
 src:*third_party/webrtc/modules/desktop_capture/linux/x_server_pixel_buffer.cc