Revert "Adding Debug to expectations"

This reverts commit ebb73616.

Reason for revert: The expectation was already correct before the CL.
Adding "Debug" actually reduces the coverage of the expection, causing
unexpected failure on non-debug builds.

Original change's description:
> Adding Debug to expectations
> 
> No-Try: true
> No-Presubmit: true
> TBR: beccahughes
> Bug: 769881
> Change-Id: If3a5a0a26b880907693d4906cfebdb42bd6f405e
> Reviewed-on: https://chromium-review.googlesource.com/690624
> Reviewed-by: Daniel Murphy <dmurph@chromium.org>
> Commit-Queue: Daniel Murphy <dmurph@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#505128}

TBR=dmurph@chromium.org

Change-Id: I63ee0115a56aebd82603b550d3d17251a55cdd06
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 769881
Reviewed-on: https://chromium-review.googlesource.com/691036Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505161}

third_party/WebKit/LayoutTests/TestExpectations

@@ -1534,7 +1534,7 @@ crbug.com/605059 [ Retina ] fast/text/international/rtl-negative-letter-spacing.
 
 crbug.com/610464 [ Linux Win7 Debug ] http/tests/devtools/components/throttler.html [ Failure Pass ]
 crbug.com/667560 [ Linux Win7 Debug ] virtual/mojo-loading/http/tests/devtools/components/throttler.html [ Failure Pass ]
-crbug.com/654477 [ Linux Mac Win7 Debug ] paint/invalidation/video-paint-invalidation.html [ Failure Crash ]
+crbug.com/654477 [ Linux Mac Win7 ] paint/invalidation/video-paint-invalidation.html [ Failure Crash ]
 crbug.com/654477 [ Win ] compositing/video/video-controls-layer-creation.html [ Pass Failure ]
 crbug.com/654477 fast/hidpi/video-controls-in-hidpi.html [ Failure ]
 crbug.com/654477 fast/layers/video-layer.html [ Failure ]