Create ChromeEarlGrey waitForWebViewContainingText.

ios/chrome/browser/ui/error_page_egtest.mm

Index: ios/chrome/browser/ui/error_page_egtest.mm
diff --git a/ios/chrome/browser/ui/error_page_egtest.mm b/ios/chrome/browser/ui/error_page_egtest.mm
index 51452b5916595b5d6ab70a0bb03d70e1ff1d1116..783847a685561d18d438fa713ebd34c1a8ab9798 100644
--- a/ios/chrome/browser/ui/error_page_egtest.mm
+++ b/ios/chrome/browser/ui/error_page_egtest.mm
@@ -4,14 +4,15 @@
 
 #import <EarlGrey/EarlGrey.h>
 
+#include "base/strings/sys_string_conversions.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"
 #import "ios/chrome/test/earl_grey/chrome_matchers.h"
 #import "ios/chrome/test/earl_grey/chrome_test_case.h"
-#import "ios/web/public/test/http_server.h"
 #import "ios/web/public/test/earl_grey/web_view_matchers.h"
+#import "ios/web/public/test/http_server.h"
 #include "ios/web/public/test/http_server_util.h"
 #include "ios/web/public/test/response_providers/data_response_provider.h"
 #include "ios/web/public/test/response_providers/error_page_response_provider.h"
@@ -24,7 +25,6 @@
 
 using chrome_test_util::OmniboxText;
 using chrome_test_util::TapWebViewElementWithId;
-using chrome_test_util::WebViewContainingText;
 using chrome_test_util::WebViewNotContainingText;
 
 using web::test::HttpServer;
@@ -139,8 +139,8 @@ using web::test::HttpServer;
 
   [ChromeEarlGrey loadURL:URL];
   // Check that the timer has completed.
-  [[EarlGrey selectElementWithMatcher:WebViewContainingText(kTimerCompleted)]
-      assertWithMatcher:grey_notNil()];
+  [ChromeEarlGrey
+      waitForWebViewContainingText:base::SysUTF8ToNSString(kTimerCompleted)];
   // DNS error page should still not appear.
   [self checkErrorPageIsNotVisible];
 }
@@ -176,8 +176,8 @@ using web::test::HttpServer;
   [ChromeEarlGrey loadURL:URL];
   TapWebViewElementWithId(kButtonId);
   // Check that the timer has completed.
-  [[EarlGrey selectElementWithMatcher:WebViewContainingText(kTimerCompleted)]
-      assertWithMatcher:grey_notNil()];
+  [ChromeEarlGrey
+      waitForWebViewContainingText:base::SysUTF8ToNSString(kTimerCompleted)];
   // DNS error page should still not appear.
   [self checkErrorPageIsNotVisible];
 }