Roll src/third_party/dawn 6f0e1f9d8235..67737f1d4a6c (2 commits)

https://dawn.googlesource.com/dawn.git/+log/6f0e1f9d8235..67737f1d4a6c


git log 6f0e1f9d8235..67737f1d4a6c --date=short --no-merges --format='%ad %ae %s'
2018-12-07 cwallez@chromium.org WireServer: Don't allow freeing the Device
2018-12-07 cwallez@chromium.org WireServer: on destruction, free all objects.


Created with:
  gclient setdep -r src/third_party/dawn@67737f1d4a6c

The AutoRoll server is located here: https://autoroll.skia.org/r/dawn-chromium-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

CQ_INCLUDE_TRYBOTS=luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel

BUG=chromium:907278,chromium:911155
TBR=cwallez@chromium.org

Change-Id: I5bd2d58ab3b7c21546f6cd52baa9f60eda9bba87
Reviewed-on: https://chromium-review.googlesource.com/c/1368204Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#614760}

DEPS

@@ -238,7 +238,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.
-  'dawn_revision': '6f0e1f9d8235842e3c1130e4133e92e850166584',
+  'dawn_revision': '67737f1d4a6c9345c731551a4d8d5fc21475a050',
 }
 
 # Only these hosts are allowed for dependencies in this DEPS file.