Remove test expectations for tests that have been already fixed.

Some test expectations have been already removed in r545969, but have
been in the meantime readded in r550463.  Some test expectations were
missed and were left in place in r545969.  Some tests are still failing.

FWIW, the affected tests pass when run 20 times locally.

Bug: 794631
Change-Id: I22ae64eab4a82c92542b65d6d336fa3832742091
Reviewed-on: https://chromium-review.googlesource.com/1169916
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581979}

third_party/WebKit/LayoutTests/FlagExpectations/site-per-process

 # These tests currently fail when they run with --site-per-process.
 # See https://crbug.com/477150.
 
-# https://crbug.com/794631: OOPIFs VS feature policy VS opaque origins?
-crbug.com/794631 virtual/unified-autoplay/external/wpt/feature-policy/autoplay-allowed-by-feature-policy-attribute.https.sub.html [ Failure ]
-crbug.com/794631 virtual/unified-autoplay/external/wpt/feature-policy/autoplay-allowed-by-feature-policy.https.sub.html [ Failure ]
-
 # https://crbug.com/793127: NOTREACHED() from clamy@ tickled by frame consolidation CL?
 crbug.com/793127 http/tests/security/upgrade-insecure-requests/iframe-upgrade.https.html [ Crash ]
 crbug.com/793127 external/wpt/content-security-policy/securitypolicyviolation/upgrade-insecure-requests-reporting.https.html [ Crash ]
@@ -339,16 +335,5 @@ crbug.com/859988 http/tests/fetch/serviceworker-proxied/thorough/scheme-data-bas
 crbug.com/859988 virtual/outofblink-cors/http/tests/fetch/serviceworker-proxied/thorough/scheme-data-base-https-other-https.html [ Failure Pass Timeout ]
 crbug.com/859988 virtual/outofblink-cors-ns/http/tests/fetch/serviceworker-proxied/thorough/scheme-data-base-https-other-https.html [ Failure Pass Timeout ]
 
-# These tests have issues with —site-per-process. https://crbug.com/794631
-crbug.com/794631 http/tests/media/autoplay/document-user-activation-cross-origin-feature-policy-delegation.html [ Failure Pass Timeout ]
-crbug.com/794631 http/tests/media/autoplay/document-user-activation-cross-origin-feature-policy-disabled.html [ Failure Pass Timeout ]
-crbug.com/794631 http/tests/media/autoplay/document-user-activation-cross-origin-feature-policy-gesture.html [ Failure Pass Timeout ]
-crbug.com/794631 http/tests/media/autoplay/document-user-activation-cross-origin-feature-policy-header.html [ Failure Pass Timeout ]
-crbug.com/794631 http/tests/media/autoplay/document-user-activation-feature-policy-alternating.html [ Failure Pass Timeout ]
-crbug.com/794631 http/tests/media/autoplay/document-user-activation-feature-policy-iframe-no-gesture.html [ Failure Pass Timeout ]
-crbug.com/794631 http/tests/media/autoplay/document-user-activation-feature-policy-same-origin.html [ Failure Pass Timeout ]
-crbug.com/794631 http/tests/media/autoplay/document-user-activation-iframe-delegation.html [ Failure Pass Timeout ]
-crbug.com/794631 virtual/user-activation-v2/http/tests/media/autoplay/document-user-activation-cross-origin-feature-policy-delegation.html [ Failure Pass Timeout ]
-crbug.com/794631 virtual/user-activation-v2/http/tests/media/autoplay/document-user-activation-cross-origin-feature-policy-disabled.html [ Failure Pass Timeout ]
-crbug.com/794631 virtual/user-activation-v2/http/tests/media/autoplay/document-user-activation-cross-origin-feature-policy-gesture.html [ Failure Pass Timeout ]
-crbug.com/794631 virtual/user-activation-v2/http/tests/media/autoplay/document-user-activation-iframe-delegation.html [ Failure Pass Timeout ]
+# https://crbug.com/872952: Autoplay is still disabled if there is no gesture.
+crbug.com/872952 http/tests/media/autoplay/document-user-activation-feature-policy-iframe-no-gesture.html [ Failure Pass Timeout ]