[ios] Disables WindowLocationTest.WindowLocationSetToDOMString on device.

ios/web/navigation/window_location_inttest.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 "base/mac/bind_objc_block.h"
 #include "base/mac/foundation_util.h"
 #include "base/memory/ptr_util.h"
 #import "base/strings/sys_string_conversions.h"
 #include "base/test/ios/wait_util.h"
 #import "ios/web/public/navigation_item.h"
@@ skipping 204 matching lines @@
                                                    kWindowLocationReloadID));
   });
 
   // Verify that |kOnLoadText| is displayed and that no additional
   // NavigationItems are added.
   EXPECT_TRUE(IsOnLoadTextVisible());
   EXPECT_EQ(1, navigation_manager()->GetItemCount());
 }
 
 // Tests that calling window.location.assign() creates a new NavigationItem.
-TEST_F(WindowLocationTest, WindowLocationSetToDOMString) {
+#if TARGET_IPHONE_SIMULATOR
+#define MAYBE_WindowLocationSetToDOMString WindowLocationSetToDOMString
+#else
+#define MAYBE_WindowLocationSetToDOMString DISABLED_WindowLocationSetToDOMString
+#endif
+// TODO(crbug.com/731740): This test is disabled because it occasionally times
+// out on device.
+TEST_F(WindowLocationTest, MAYBE_WindowLocationSetToDOMString) {
   // Navigate to about:blank so there is a forward entry to prune.
   GURL about_blank("about:blank");
   LoadUrl(about_blank);
   web::NavigationItem* about_blank_item =
       navigation_manager()->GetLastCommittedItem();
 
   // Navigate back to the window.location test page.
   ExecuteBlockAndWaitForLoad(window_location_url(), ^{
     navigation_manager()->GoBack();
   });
 
   // Set the window.location test URL and tap the window.location.assign()
   // button.
   GURL sample_url = web::test::HttpServer::MakeUrl(kSampleFileBasedURL);
   SetWindowLocationUrl(sample_url);
   ExecuteBlockAndWaitForLoad(sample_url, ^{
     ASSERT_TRUE(web::test::TapWebViewElementWithId(
         web_state(), kWindowLocationSetToDOMStringID));
   });
 
   // Verify that |sample_url| was loaded and that |about_blank_item| was pruned.
   EXPECT_EQ(sample_url, navigation_manager()->GetLastCommittedItem()->GetURL());
   EXPECT_EQ(NSNotFound, GetIndexOfNavigationItem(about_blank_item));
 }