Correct iOS build for latest Xcode beta.

ios/web/web_state/js/crw_js_early_script_manager_unittest.mm

 // Copyright 2014 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/web/web_state/js/crw_js_early_script_manager.h"
 
 #include "base/mac/scoped_nsobject.h"
 #import "ios/web/public/test/crw_test_js_injection_receiver.h"
 #include "ios/web/public/web_client.h"
 #import "ios/web/web_state/js/page_script_util.h"
@@ skipping 25 matching lines @@
 };
 
 // Tests that CRWJSEarlyScriptManager's content is the same as returned by
 // web::GetEarlyPageScript.
 TEST_F(CRWJSEarlyScriptManagerTest, Content) {
   NSString* injectionContent = [earlyScriptManager_ staticInjectionContent];
   NSString* earlyScript = GetEarlyPageScript([receiver_ webViewType]);
   // |earlyScript| is a substring of |injectionContent|. The latter wraps the
   // former with "if (typeof __gCrWeb !== 'object')" check to avoid multiple
   // injections.
-  EXPECT_NE(NSNotFound, [injectionContent rangeOfString:earlyScript].location);
+  // TODO(justincohen): Cast indexOfObject to work around Xcode beta bugs.
+  // Revisit in future betas where hopefully these types match again.
+  // crbug.com/498825
+  EXPECT_NE(NSNotFound,
+            static_cast<NSInteger>(
+                [injectionContent rangeOfString:earlyScript].location));
 }
 
 }  // namespace
 }  // namespace web