Enable on fast/harness/internals-observe-gc.html win10

Fix for this landed here:
https://chromium-review.googlesource.com/c/chromium/src/+/1800855

Bug: chromium:1003268
Change-Id: Ibf7056e406239b85275bb31e24ed39dd34577169
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1844970
Auto-Submit: Mythri Alle <mythria@chromium.org>
Commit-Queue: Keishi Hattori <keishi@chromium.org>
Reviewed-by: Keishi Hattori <keishi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703639}

third_party/blink/web_tests/TestExpectations

@@ -6138,7 +6138,7 @@ crbug.com/1003055 virtual/threaded/external/wpt/css/css-scroll-snap/scroll-targe
 crbug.com/1003055 virtual/threaded/external/wpt/css/css-scroll-snap/scroll-target-snap-003.html [ Failure ]
 
 # Sheriff 2019-09-12
-crbug.com/1003268 [ Win10 Win7 ] fast/harness/internals-observe-gc.html [ Failure ]
+crbug.com/1011515 [ Win7 ] fast/harness/internals-observe-gc.html [ Failure ]
 crbug.com/731018 [ Mac ] external/wpt/accelerometer/Accelerometer.https.html [ Pass Failure ]
 crbug.com/731018 [ Mac ] external/wpt/gyroscope/Gyroscope.https.html [ Pass Failure ]
 crbug.com/731018 [ Mac ] external/wpt/orientation-sensor/AbsoluteOrientationSensor.https.html [ Pass Failure ]