webkit_tests failing on chromium.webkit/WebKit Mac10.9

Builders failed on: 
- WebKit Mac10.9: 
  https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.9


First build to exhibit this error:
https://uberchromegw.corp.google.com/i/chromium.webkit/builders/WebKit%20Mac10.9/builds/45684
webkit_tests webkit_tests
Total tests: 69797
* Passed: 57156 (57080 expected, 76 unexpected)
* Skipped: 11818 (11818 expected, 0 unexpected)
* Failed: 767 (766 expected, >>>1 unexpected<<<)
* Flaky: 56 (55 expected, >>>1 unexpected<<<)
Unexpected Failures:
* fast/text/variable-fonts/variable-gpos-m2b.html
Unexpected Flakes:
* external/wpt/fetch/api/basic/integrity-sharedworker.html


https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium.webkit%2FWebKit_Mac10.9%2F45684%2F%2B%2Frecipes%2Fsteps%2Fwebkit_tests%2F0%2Fstdout
------------------------------- 8< -------------------------------
10:41:09.651 7596 worker/0 external/wpt/fetch/api/basic/integrity-sharedworker.html crashed, (stderr lines):
10:41:09.651 7596   Received signal 11 SEGV_MAPERR 000000000018
10:41:09.651 7596    [0x0001037b28bc]
10:41:09.651 7596    [0x0001037b27b1]
10:41:09.651 7596    [0x7fff896d95aa]
10:41:09.651 7596    [0x0001053502b4]
10:41:09.651 7596    [0x00010602a72a]
10:41:09.651 7596    [0x000104e13327]
10:41:09.651 7596    [0x0001037b30e1]
10:41:09.651 7596    [0x00010535566f]
10:41:09.651 7596    [0x0001053536e2]
10:41:09.651 7596    [0x0001037b30e1]
10:41:09.651 7596    [0x0001037d8eab]
10:41:09.651 7596    [0x0001037d91fc]
10:41:09.651 7596    [0x0001037d95b3]
10:41:09.651 7596    [0x0001037dca0a]
10:41:09.651 7596    [0x0001037ce97a]
10:41:09.651 7596    [0x0001037dc42f]
10:41:09.651 7596    [0x7fff8db635b1]
10:41:09.651 7596    [0x7fff8db54c62]
10:41:09.651 7596    [0x7fff8db543ef]
10:41:09.652 7596    [0x7fff8db53e75]
10:41:09.652 7596    [0x0001037dcdbf]
10:41:09.652 7596    [0x0001037dc86c]
10:41:09.652 7596    [0x0001037d8b7e]
10:41:09.652 7596    [0x0001037f6b33]
10:41:09.652 7596    [0x000103822909]
10:41:09.652 7596    [0x00010381d597]
10:41:09.652 7596    [0x7fff88ba8899]
10:41:09.652 7596    [0x7fff88ba872a]
10:41:09.652 7596    [0x7fff88bacfc9]
10:41:09.652 7596   [end of stack trace]
10:41:09.655 7565 [27276/57979] external/wpt/fetch/api/basic/integrity-sharedworker.html failed unexpectedly (renderer crashed)
10:41:09.653 7596 worker/0 killing primary driver
10:41:09.654 7596 worker/0 killing secondary driver
10:41:09.654 7596 worker/0 external/wpt/fetch/api/basic/integrity-sharedworker.html failed:
10:41:09.654 7596 worker/0  renderer crashed
------------------------------- 8< -------------------------------