Create ChromeEarlGrey waitForWebViewContainingText.

ios/chrome/browser/web/window_open_by_dom_egtest.mm

Index: ios/chrome/browser/web/window_open_by_dom_egtest.mm
diff --git a/ios/chrome/browser/web/window_open_by_dom_egtest.mm b/ios/chrome/browser/web/window_open_by_dom_egtest.mm
index 7938f833132bd52b361dd648fe7d0d668e582be0..8b5530c6cd403bae1e9701cce56afef222ac9725 100644
--- a/ios/chrome/browser/web/window_open_by_dom_egtest.mm
+++ b/ios/chrome/browser/web/window_open_by_dom_egtest.mm
@@ -19,7 +19,6 @@
 using chrome_test_util::AssertMainTabCount;
 using chrome_test_util::OmniboxText;
 using chrome_test_util::TapWebViewElementWithId;
-using chrome_test_util::WebViewContainingText;
 using web::test::HttpServer;
 
 namespace {
@@ -48,8 +47,7 @@ const char kTestURL[] =
   [super setUp];
   // Open the test page. There should only be one tab open.
   [ChromeEarlGrey loadURL:HttpServer::MakeUrl(kTestURL)];
-  [[EarlGrey selectElementWithMatcher:WebViewContainingText("Expected result")]
-      assertWithMatcher:grey_notNil()];
+  [ChromeEarlGrey waitForWebViewContainingText:@"Expected result"];
   AssertMainTabCount(1);
 }
 
@@ -71,8 +69,7 @@ const char kTestURL[] =
 
   TapWebViewElementWithId("webScenarioWindowOpenSameURLWithBlankTarget");
   AssertMainTabCount(2);
-  [[EarlGrey selectElementWithMatcher:WebViewContainingText("Expected result")]
-      assertWithMatcher:grey_notNil()];
+  [ChromeEarlGrey waitForWebViewContainingText:@"Expected result"];
 
   id value = ExecuteJavaScript(@"sessionStorage.getItem('key');", &error);
   GREYAssert(!error, @"Error during script execution: %@", error);