Disable testLongPDFScroll on devices

ios/chrome/browser/ui/fullscreen_egtest.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 <EarlGrey/EarlGrey.h>
 #import <UIKit/UIKit.h>
 #import <XCTest/XCTest.h>
 
 #include "base/ios/ios_util.h"
 #include "base/mac/bind_objc_block.h"
@@ skipping 121 matching lines @@
   [ChromeEarlGreyUI waitForToolbarVisible:YES];
 
   // Test that the toolbar is no longer visible after a user swipes up.
   HideToolbarUsingUI();
   [ChromeEarlGreyUI waitForToolbarVisible:NO];
 }
 
 // Verifies that the toolbar properly appears/disappears when scrolling up/down
 // on a PDF that is long in length and wide in width.
 - (void)testLongPDFScroll {
+// TODO(crbug.com/714329): Re-enable this test on devices.
+#if !TARGET_IPHONE_SIMULATOR
+  EARL_GREY_TEST_DISABLED(@"Test disabled on device.");
+#endif
+
   web::test::SetUpFileBasedHttpServer();
   GURL URL = web::test::HttpServer::MakeUrl(
       "http://ios/testing/data/http_server_files/two_pages.pdf");
   [ChromeEarlGrey loadURL:URL];
 
   // Test that the toolbar is hidden after a user swipes up.
   HideToolbarUsingUI();
   [ChromeEarlGreyUI waitForToolbarVisible:NO];
 
   // Test that the toolbar is visible after a user swipes down.
@@ skipping 254 matching lines @@
   [ChromeEarlGrey loadURL:URL];
   HideToolbarUsingUI();
   [ChromeEarlGreyUI waitForToolbarVisible:NO];
 
   chrome_test_util::TapWebViewElementWithId("link");
   AssertURLIs(ErrorPageResponseProvider::GetDnsFailureUrl());
   [ChromeEarlGreyUI waitForToolbarVisible:YES];
 }
 
 @end