Sheriff: Mark virtual/web-components-v0-disabled/fast/dom/gc-dom-tree-lifetime.html as slow

Bug: 606649
Change-Id: Idd167bede988cd5c263082b51387572d10bb7a34
Notry: true
Tbr: nhiroki@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1990891Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729616}

third_party/blink/web_tests/SlowTests

@@ -198,6 +198,7 @@ crbug.com/614910 virtual/gpu-rasterization/images/yuv-decode-eligible/color-prof
 crbug.com/623798 paint/images/animated-gif-last-frame-crash.html [ Slow ]
 
 crbug.com/606649 fast/dom/gc-dom-tree-lifetime.html [ Slow ]
+crbug.com/606649 virtual/web-components-v0-disabled/fast/dom/gc-dom-tree-lifetime.html [ Slow ]
 
 # Slow on Win Debug in part due to incremental linking.
 crbug.com/647192 [ Win Debug ] fast/css3-text/css3-word-break/word-break-all-ascii.html [ Slow ]