[Fuchsia] Disable Vulkan in runners.

GPU process is leaking memory when Vulkan is enabled. Disable Vulkan
temporarily until that issue is resolved.

Bug: 1001296
Change-Id: I4f4bd55b0a1cf5690b8bcfee8dccce5babb1de58
TBR: wez@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1790411Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694485}

fuchsia/runners/cast/main.cc

@@ -16,9 +16,7 @@ int main(int argc, char** argv) {
 
   constexpr fuchsia::web::ContextFeatureFlags kCastRunnerFeatures =
       fuchsia::web::ContextFeatureFlags::NETWORK |
-      fuchsia::web::ContextFeatureFlags::AUDIO |
-      fuchsia::web::ContextFeatureFlags::VULKAN |
-      fuchsia::web::ContextFeatureFlags::HARDWARE_VIDEO_DECODER;
+      fuchsia::web::ContextFeatureFlags::AUDIO;
 
   CastRunner runner(
       base::fuchsia::ComponentContextForCurrentProcess()->outgoing().get(),

fuchsia/runners/web/main.cc

@@ -16,9 +16,7 @@ int main(int argc, char** argv) {
 
   constexpr fuchsia::web::ContextFeatureFlags kWebRunnerFeatures =
       fuchsia::web::ContextFeatureFlags::NETWORK |
-      fuchsia::web::ContextFeatureFlags::AUDIO |
-      fuchsia::web::ContextFeatureFlags::VULKAN |
-      fuchsia::web::ContextFeatureFlags::HARDWARE_VIDEO_DECODER;
+      fuchsia::web::ContextFeatureFlags::AUDIO;
 
   WebContentRunner runner(
       base::fuchsia::ComponentContextForCurrentProcess()->outgoing().get(),