Enable testClearCookies Settings EG2 test

Now that cookies EG2 utility method is fixed this test can be enabled.

Bug: 1038398, 1036133
Change-Id: I9c1b0d39f9dd74b3ed9fc01b2d51e8bcc63a367b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2037832
Commit-Queue: Eugene But <eugenebut@chromium.org>
Auto-Submit: Mohammad Refaat <mrefaat@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738970}

ios/chrome/browser/ui/settings/settings_egtest.mm

@@ -351,10 +351,7 @@ id<GREYMatcher> ClearBrowsingDataCell() {
 // Tests that clearing the cookies through the UI does clear all of them. Use a
 // local server to navigate to a page that sets then tests a cookie, and then
 // clears the cookie and tests it is not set.
-// TODO(crbug.com/1036133): [ChromeEarlGrey cookies] does not work correctly in
-// this test.
-// TODO(crbug.com/1038398): This test crashes flakily.
-- (void)DISABLED_testClearCookies {
+- (void)testClearCookies {
   // Creates a map of canned responses and set up the test HTML server.
   std::map<GURL, std::pair<std::string, std::string>> response;