Re-enable EarlGrey tests that check static error pages.

ios/chrome/browser/ui/error_page_egtest.mm

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import <EarlGrey/EarlGrey.h>
 
 #include "components/strings/grit/components_strings.h"
 #import "ios/chrome/test/app/chrome_test_util.h"
 #include "ios/chrome/test/app/web_view_interaction_test_util.h"
 #import "ios/chrome/test/earl_grey/chrome_earl_grey.h"
@@ skipping 26 matching lines @@
 @end
 
 @implementation ErrorPageTestCase
 
 #pragma mark - utilities
 
 // TODO(crbug.com/638674): Evaluate if this can move to shared code.
 - (void)checkErrorPageIsVisible {
   // The DNS error page is static HTML content, so it isn't part of the webview
   // owned by the webstate.
-  id<GREYMatcher> webViewMatcher =
-      web::WebViewInWebState(chrome_test_util::GetCurrentWebState());
-  [[EarlGrey selectElementWithMatcher:webViewMatcher]
-      assertWithMatcher:grey_nil()];
   NSString* const kError =
       l10n_util::GetNSString(IDS_ERRORPAGES_HEADING_NOT_AVAILABLE);
   [[EarlGrey selectElementWithMatcher:StaticHtmlViewContainingText(kError)]
       assertWithMatcher:grey_notNil()];
 }
 
 - (void)checkErrorPageIsNotVisible {
   // Check that the webview belongs to the web controller, and that the error
   // text doesn't appear in the webview.
   id<GREYMatcher> webViewMatcher =
       web::WebViewInWebState(chrome_test_util::GetCurrentWebState());
   [[EarlGrey selectElementWithMatcher:webViewMatcher]
       assertWithMatcher:grey_notNil()];
   const std::string kError =
       l10n_util::GetStringUTF8(IDS_ERRORPAGES_HEADING_NOT_AVAILABLE);
   [[EarlGrey selectElementWithMatcher:WebViewContainingText(kError)]
       assertWithMatcher:grey_nil()];
 }
 
 #pragma mark - tests
 
 // Tests whether the error page is displayed for a bad URL.
-// TODO(crbug.com/684987): Re-enable this test.
-- (void)DISABLED_testErrorPage {
+- (void)testErrorPage {
   std::unique_ptr<web::DataResponseProvider> provider(
       new ErrorPageResponseProvider());
   web::test::SetUpHttpServer(std::move(provider));
 
   [ChromeEarlGrey loadURL:ErrorPageResponseProvider::GetDnsFailureUrl()];
 
   [self checkErrorPageIsVisible];
 }
 
 // Tests whether the error page is displayed if it is behind a redirect.
-// TODO(crbug.com/684987): Re-enable this test.
-- (void)DISABLED_testErrorPageRedirect {
+- (void)testErrorPageRedirect {
   std::unique_ptr<web::DataResponseProvider> provider(
       new ErrorPageResponseProvider());
   web::test::SetUpHttpServer(std::move(provider));
 
   // Load a URL that redirects to the DNS-failing URL.
   [ChromeEarlGrey
       loadURL:ErrorPageResponseProvider::GetRedirectToDnsFailureUrl()];
 
   // Verify that the redirect occurred before checking for the DNS error.
   const std::string& redirectedURL =
@@ skipping 82 matching lines @@
   [ChromeEarlGrey loadURL:URL];
   TapWebViewElementWithId(kButtonId);
   // Check that the timer has completed.
   [[EarlGrey selectElementWithMatcher:WebViewContainingText(kTimerCompleted)]
       assertWithMatcher:grey_notNil()];
   // DNS error page should still not appear.
   [self checkErrorPageIsNotVisible];
 }
 
 @end