Revert "Disable flaky ActivationStateComputingThrottleSubFrameTest.DisabledStatePropagated/"

This reverts commit d0e722ab.

Reason for revert: Root cause is unrelated to this test. See crbug.com/1011275

Original change's description:
> Disable flaky ActivationStateComputingThrottleSubFrameTest.DisabledStatePropagated/
> 
> TBR=battre@chromium.org
> 
> Bug: 1011200
> Change-Id: I44f5b3ba33c861b2885da30ea561a68adba014bd
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1839153
> Reviewed-by: Yoichi Osato <yoichio@chromium.org>
> Commit-Queue: Yoichi Osato <yoichio@chromium.org>
> Auto-Submit: Yoichi Osato <yoichio@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#702696}

TBR=battre@chromium.org,yoichio@chromium.org

Change-Id: Ia57fab30fb662742acf368325f05700b6d86a2a7
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1011200
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1840092Reviewed-by: Dominic Battré <battre@chromium.org>
Commit-Queue: Dominic Battré <battre@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702777}

components/subresource_filter/content/browser/activation_state_computing_navigation_throttle_unittest.cc

@@ -441,8 +441,7 @@ TEST_P(ActivationStateComputingThrottleSubFrameTest,
   EXPECT_FALSE(state.generic_blocking_rules_disabled);
 }
 
-TEST_P(ActivationStateComputingThrottleSubFrameTest,
-       DISABLED_DisabledStatePropagated) {
+TEST_P(ActivationStateComputingThrottleSubFrameTest, DisabledStatePropagated) {
   NavigateAndCommitMainFrameWithPageActivationState(
       GURL("http://allow-child-to-be-whitelisted.com/"),
       mojom::ActivationLevel::kEnabled);