Enable WebGLContextPresentWithVulkanFeature test

VulkanWebEngineIntegrationTest.WebGLContextPresentWithVulkanFeature no
longer fails in local or bot testing so re-enable it.

Bug: 1104563
Change-Id: I8d91d71fb7916a9c2c5da559571aee08a23707f6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2446449
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813795}

fuchsia/engine/web_engine_integration_test.cc

@@ -690,9 +690,8 @@ TEST_F(WebEngineIntegrationTest, WebGLContextAbsentWithoutVulkanFeature) {
 #endif
 class MAYBE_VulkanWebEngineIntegrationTest : public WebEngineIntegrationTest {};
 
-// TODO(crbug.com/1104563): Flakily times-out.
 TEST_F(MAYBE_VulkanWebEngineIntegrationTest,
-       DISABLED_WebGLContextPresentWithVulkanFeature) {
+       WebGLContextPresentWithVulkanFeature) {
   fuchsia::web::CreateContextParams create_params = DefaultContextParams();
   create_params.set_features(fuchsia::web::ContextFeatureFlags::VULKAN);
   CreateContextAndFrame(std::move(create_params));