Use shared matchers for common elements.

ios/chrome/test/earl_grey/chrome_matchers.mm

Index: ios/chrome/test/earl_grey/chrome_matchers.mm
diff --git a/ios/chrome/test/earl_grey/chrome_matchers.mm b/ios/chrome/test/earl_grey/chrome_matchers.mm
index 8525323f5a3ab96aef25edf2f3c08b74edb0eabe..bf7833c9c31efeb93ed9c42f37f6a7a95fcc638e 100644
--- a/ios/chrome/test/earl_grey/chrome_matchers.mm
+++ b/ios/chrome/test/earl_grey/chrome_matchers.mm
@@ -227,4 +227,8 @@ id<GREYMatcher> CollectionViewSwitchCell(NSString* accessibilityIdentifier,
                     nil);
 }
 
+id<GREYMatcher> OpenLinkInNewTabMenuItem() {
+  return ButtonWithAccessibilityLabelId(IDS_IOS_CONTENT_CONTEXT_OPENLINKNEWTAB);
+}
+
 }  // namespace chrome_test_util