Create ChromeEarlGrey waitForWebViewContainingText.

ios/chrome/test/earl_grey/device_check_egtest.mm

Index: ios/chrome/test/earl_grey/device_check_egtest.mm
diff --git a/ios/chrome/test/earl_grey/device_check_egtest.mm b/ios/chrome/test/earl_grey/device_check_egtest.mm
index 91a0428dd3d54f99e6744ee330be95aa2c38b775..4ad778091a1e5ef8ed8a43d6c13e9b6be3dcdfa2 100644
--- a/ios/chrome/test/earl_grey/device_check_egtest.mm
+++ b/ios/chrome/test/earl_grey/device_check_egtest.mm
@@ -9,8 +9,6 @@
 #import "ios/chrome/test/earl_grey/chrome_test_case.h"
 #include "url/gurl.h"
 
-using chrome_test_util::WebViewContainingText;
-
 // Test suite to verify Internet connectivity.
 @interface DeviceCheckTestCase : ChromeTestCase
 @end
@@ -20,8 +18,7 @@ using chrome_test_util::WebViewContainingText;
 // Verifies Internet connectivity by navigating to browsingtest.appspot.com.
 - (void)testNetworkConnection {
   [ChromeEarlGrey loadURL:GURL("http://browsingtest.appspot.com")];
-  [[EarlGrey selectElementWithMatcher:WebViewContainingText("Window1")]
-      assertWithMatcher:grey_notNil()];
+  [ChromeEarlGrey waitForWebViewContainingText:@"Window1"];
 }
 
 @end