Fix iOS after https://codereview.chromium.org/1278433002/

Inadvertently removed lines from ios_chrome.gyp due to a bad rebase.

Review URL: https://codereview.chromium.org/1274213004

Cr-Commit-Position: refs/heads/master@{#342361}

ios/chrome/ios_chrome.gyp

@@ -271,6 +271,8 @@
         'browser/net/metrics_network_client_manager.mm',
         'browser/net/retryable_url_fetcher.h',
         'browser/net/retryable_url_fetcher.mm',
+        'browser/open_from_clipboard/create_clipboard_recent_content.h',
+        'browser/open_from_clipboard/create_clipboard_recent_content.mm',
         'browser/passwords/password_generation_utils.h',
         'browser/passwords/password_generation_utils.mm',
         'browser/pref_names.cc',