Use shared matchers for common elements.

ios/chrome/test/earl_grey/chrome_matchers.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 "ios/chrome/test/earl_grey/chrome_matchers.h"
 
 #import <OCHamcrest/OCHamcrest.h>
 
 #import <WebKit/WebKit.h>
 
@@ skipping 209 matching lines @@
                     grey_sufficientlyVisible(), nil);
 }
 
 id<GREYMatcher> CollectionViewSwitchCell(NSString* accessibilityIdentifier,
                                          BOOL isOn) {
   return grey_allOf(grey_accessibilityID(accessibilityIdentifier),
                     CollectionViewSwitchIsOn(isOn), grey_sufficientlyVisible(),
                     nil);
 }
 
+id<GREYMatcher> OpenLinkInNewTabMenuItem() {
+  return ButtonWithAccessibilityLabelId(IDS_IOS_CONTENT_CONTEXT_OPENLINKNEWTAB);
+}
+
 }  // namespace chrome_test_util