Create ChromeEarlGrey waitForWebViewContainingText.

ios/chrome/browser/ui/find_bar/find_in_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 <XCTest/XCTest.h>
 
 #include "base/strings/string_number_conversions.h"
 #include "components/strings/grit/components_strings.h"
 #import "ios/chrome/browser/find_in_page/find_in_page_controller.h"
 #import "ios/chrome/browser/ui/find_bar/find_bar_controller_ios.h"
@@ skipping 15 matching lines @@
 #error "This file requires ARC support."
 #endif
 
 namespace {
 
 // Test web page content.
 const std::string kFindInPageResponse = "Find in page. Find in page.";
 
 }  // namespace
 
-using chrome_test_util::WebViewContainingText;
-
 // Tests for Find in Page.
 @interface FindInPageTestCase : ChromeTestCase
 
 // URL for a test page with |kFindInPageResponse|.
 @property(nonatomic, assign) GURL testURL;
 
 // Opens Find in Page.
 - (void)openFindInPage;
 // Closes Find in page.
 - (void)closeFindInPage;
@@ skipping 168 matching lines @@
   [[EarlGrey selectElementWithMatcher:grey_accessibilityID(
                                           kFindInPagePreviousButtonId)]
       performAction:grey_tap()];
 }
 
 - (void)navigateToTestPage {
   // Navigate to a page with some text.
   [ChromeEarlGrey loadURL:self.testURL];
 
   // Verify web page finished loading.
-  [[EarlGrey
-      selectElementWithMatcher:WebViewContainingText(kFindInPageResponse)]
-      assertWithMatcher:grey_notNil()];
+  [ChromeEarlGrey waitForWebViewContainingText:kFindInPageResponse];
 }
 
 @end