Update expectations for passing IndexedDB/keypath-exceptions test

An -expected.txt file was expecting a failure, but the test is passing
now. A TestExpectations entry was added. Remove the -expected.txt and
the entry instead.

See also:
https://chromium-review.googlesource.com/c/chromium/src/+/2018565
https://chromium-review.googlesource.com/c/chromium/src/+/2017123

TBR=ioanap

Bug: 1047126
Change-Id: Icbec35915d21878ec260ee2fff3fcaf7d6818fb6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036367Reviewed-by: Joshua Bell <jsbell@chromium.org>
Commit-Queue: Joshua Bell <jsbell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738231}

third_party/blink/web_tests/TestExpectations

@@ -6434,7 +6434,6 @@ crbug.com/1041847 virtual/gpu/fast/canvas/color-space/canvas-colorManaged-conver
 crbug.com/995663 [ Linux ] http/tests/media/autoplay/document-user-activation-cross-origin-feature-policy-header.html [ Pass Failure Timeout ]
 
 # Sheriff 2020-01-30
-crbug.com/1047126 [ Win ] external/wpt/IndexedDB/keypath-exceptions.htm [ Failure ]
 crbug.com/1047164 [ Mac ] fast/scroll-snap/snaps-after-keyboard-scrolling.html [ Pass Failure ]
 crbug.com/1047208 virtual/omt-service-worker-startup/http/tests/serviceworker/update-served-from-cache.html [ Pass Failure ]
 crbug.com/1047208 http/tests/serviceworker/update-served-from-cache.html [ Pass Failure ]

third_party/blink/web_tests/platform/win7/external/wpt/IndexedDB/keypath-exceptions-expected.txt

-This is a testharness.js-based test.
-PASS The last element of keypath is validated
-PASS Key path evaluation: Exceptions from non-enumerable getters
-PASS Key path evaluation: Exceptions from enumerable getters
-PASS Key path evaluation: Exceptions from non-enumerable getters on prototype
-PASS Key path evaluation: Exceptions from enumerable getters on prototype
-FAIL Array key conversion should not invoke prototype getters assert_equals: Prototype getter should not be called expected 0 but got 5
-Harness: the test ran to completion.
-