Refactor web shell integration tests utilities.

ios/web/shell/test/shell_matchers.mm

Index: ios/web/shell/test/shell_matchers.mm
diff --git a/ios/web/shell/test/shell_matchers.mm b/ios/web/shell/test/shell_matchers.mm
deleted file mode 100644
index 52d9d614128fa7c1b17400b3be39ae044fdfa8fe..0000000000000000000000000000000000000000
--- a/ios/web/shell/test/shell_matchers.mm
+++ /dev/null
@@ -1,39 +0,0 @@
-// 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 "ios/web/shell/test/shell_matchers.h"
-
-#import "ios/web/shell/view_controller.h"
-
-namespace web {
-
-id<GREYMatcher> backButton() {
-  return [GREYMatchers matcherForWebShellBackButton];
-}
-
-id<GREYMatcher> forwardButton() {
-  return [GREYMatchers matcherForWebShellForwardButton];
-}
-
-id<GREYMatcher> addressField() {
-  return [GREYMatchers matcherForWebShellAddressField];
-}
-
-}  // namespace web
-
-@implementation GREYMatchers (WebShellAdditions)
-
-+ (id<GREYMatcher>)matcherForWebShellBackButton {
-  return grey_accessibilityLabel(kWebShellBackButtonAccessibilityLabel);
-}
-
-+ (id<GREYMatcher>)matcherForWebShellForwardButton {
-  return grey_accessibilityLabel(kWebShellForwardButtonAccessibilityLabel);
-}
-
-+ (id<GREYMatcher>)matcherForWebShellAddressField {
-  return grey_accessibilityLabel(kWebShellAddressFieldAccessibilityLabel);
-}
-
-@end