Revert "Disable WebViewThreadTest#testCookieManagerBeforeCreateWebView"

This reverts commit 4f081fd8.

Reason for revert: Reverted culprit CL, shouldn't have disabled this test.

Original change's description:
> Disable WebViewThreadTest#testCookieManagerBeforeCreateWebView
> 
> TBR: timvolodine@chromium.org
> Bug: 1117683
> Change-Id: Ibb9538fc0530dd48effa973af8628565af639b32
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2363486
> Reviewed-by: Sky Malice <skym@chromium.org>
> Commit-Queue: Sky Malice <skym@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#799356}

TBR=timvolodine@chromium.org,skym@chromium.org

Change-Id: I9a70de742d31933e21e49f2e8fc49a5a61641466
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1117683
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2362971Reviewed-by: Sky Malice <skym@chromium.org>
Commit-Queue: Sky Malice <skym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799517}

android_webview/tools/system_webview_shell/layout_tests/src/org/chromium/webview_shell/test/WebViewThreadTest.java

@@ -22,7 +22,6 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 
 import org.chromium.base.test.BaseJUnit4ClassRunner;
-import org.chromium.base.test.util.DisabledTest;
 import org.chromium.webview_shell.WebViewThreadTestActivity;
 
 /**
@@ -97,7 +96,6 @@ public class WebViewThreadTest {
      */
     @Test
     @SmallTest
-    @DisabledTest(message = "https://crubg.com/1117683")
     public void testCookieManagerBeforeCreateWebView() throws InterruptedException {
         CookieManager.getInstance();
         mActivity.createWebViewOnUiThread(TIMEOUT);