Adding a workaround for WebRTC DCHECK

This change introduces a workaround and a TODO for the WebRTC DCHECK
that we have been manually working around.  We will continue to
work on the proper solution and remove this workaround once it is ready.

Note: I also updated the name of the method being commented out due to an
error that occurs during CL validation prior to uploading.

BUG=793486

Change-Id: Ibb77bf509f28698a4c3564c85386b6362a98daad
Reviewed-on: https://chromium-review.googlesource.com/850442
Commit-Queue: Lambros Lambrou <lambroslambrou@chromium.org>
Reviewed-by: Lambros Lambrou <lambroslambrou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#527079}

remoting/host/chromoting_host_context.cc

@@ -19,7 +19,8 @@ namespace {
 
 void DisallowBlockingOperations() {
   base::ThreadRestrictions::SetIOAllowed(false);
-  base::ThreadRestrictions::DisallowWaiting();
+  // TODO(crbug.com/793486): Re-enable after the underlying issue is fixed.
+  // base::ThreadRestrictions::DisallowBaseSyncPrimitives();
 }
 
 }  // namespace