Remove matcher to wait for static HTML view.

ios/chrome/browser/metrics/tab_usage_recorder_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>
 #import <XCTest/XCTest.h>
 
 #include "base/mac/bind_objc_block.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/stringprintf.h"
@@ skipping 180 matching lines @@
         performAction:grey_tap()];
   }
   ConditionBlock condition = ^bool {
     return !chrome_test_util::IsIncognitoMode();
   };
   GREYAssert(
       testing::WaitUntilConditionOrTimeout(kWaitElementTimeout, condition),
       @"Waiting switch to normal mode.");
 }
 
-// Check that the error page is visible.
-void CheckErrorPageIsVisible() {
-  // The DNS error page is static HTML content.
-  NSString* const kError =
-      l10n_util::GetNSString(IDS_ERRORPAGES_HEADING_NOT_AVAILABLE);
-  [[EarlGrey
-      selectElementWithMatcher:chrome_test_util::StaticHtmlViewContainingText(
-                                   kError)] assertWithMatcher:grey_notNil()];
-}
-
 // Open the settings submenu. Assumes that settings menu is visible.
 void OpenSettingsSubMenuUnsynced(int submenu) {
   id<GREYMatcher> settings_button_matcher =
       grey_text(l10n_util::GetNSString(submenu));
   [[[EarlGrey selectElementWithMatcher:settings_button_matcher]
          usingSearchAction:grey_swipeSlowInDirection(kGREYDirectionUp)
       onElementWithMatcher:grey_accessibilityID(kSettingsCollectionViewId)]
       performAction:grey_tap()];
 }
 
@@ skipping 287 matching lines @@
   chrome_test_util::HistogramTester histogramTester;
   FailureBlock failureBlock = ^(NSString* error) {
     GREYFail(error);
   };
 
   // This URL is purposely invalid so it triggers a navigation error.
   GURL invalidURL(kTestUrl1);
 
   chrome_test_util::OpenNewTab();
   [ChromeEarlGrey loadURL:invalidURL];
-  CheckErrorPageIsVisible();
+  [ChromeEarlGrey waitForErrorPage];
   OpenNewIncognitoTabUsingUIAndEvictMainTabs();
 
   SwitchToNormalMode();
-  CheckErrorPageIsVisible();
+  [ChromeEarlGrey waitForErrorPage];
 
   histogramTester.ExpectUniqueSample(kEvictedTabReloadSuccessRate,
                                      TabUsageRecorder::LOAD_FAILURE, 1,
                                      failureBlock);
   histogramTester.ExpectUniqueSample(kDidUserWaitForEvictedTabReload,
                                      TabUsageRecorder::USER_WAITED, 1,
                                      failureBlock);
   histogramTester.ExpectTotalCount(kEvictedTabReloadTime, 0, failureBlock);
 }
 
@@ skipping 405 matching lines @@
     [[GREYUIThreadExecutor sharedInstance] drainUntilIdle];
   }
   // The deleted tabs are purged during foregrounding and backgrounding.
   chrome_test_util::SimulateTabsBackgrounding();
   // Make sure |evicted_tabs_| purged the deleted tabs.
   int evicted = chrome_test_util::GetEvictedMainTabCount();
   GREYAssertEqual(evicted, 0, @"Check number of evicted tabs");
 }
 
 @end