Create ChromeEarlGrey waitForWebViewContainingText.

ios/chrome/browser/ui/find_bar/find_in_page_egtest.mm

Index: ios/chrome/browser/ui/find_bar/find_in_page_egtest.mm
diff --git a/ios/chrome/browser/ui/find_bar/find_in_page_egtest.mm b/ios/chrome/browser/ui/find_bar/find_in_page_egtest.mm
index 0864dcc923a7431ec949e0dc3abe7fc935015052..701579ea43fcb3b293193ab04a9697aac04c4624 100644
--- a/ios/chrome/browser/ui/find_bar/find_in_page_egtest.mm
+++ b/ios/chrome/browser/ui/find_bar/find_in_page_egtest.mm
@@ -5,6 +5,7 @@
 #import <XCTest/XCTest.h>
 
 #include "base/strings/string_number_conversions.h"
+#include "base/strings/sys_string_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"
@@ -33,8 +34,6 @@ const std::string kFindInPageResponse = "Find in page. Find in page.";
 
 }  // namespace
 
-using chrome_test_util::WebViewContainingText;
-
 // Tests for Find in Page.
 @interface FindInPageTestCase : ChromeTestCase
 
@@ -223,9 +222,8 @@ using chrome_test_util::WebViewContainingText;
   [ChromeEarlGrey loadURL:self.testURL];
 
   // Verify web page finished loading.
-  [[EarlGrey
-      selectElementWithMatcher:WebViewContainingText(kFindInPageResponse)]
-      assertWithMatcher:grey_notNil()];
+  [ChromeEarlGrey waitForWebViewContainingText:base::SysUTF8ToNSString(
+                                                   kFindInPageResponse)];
 }
 
 @end