Correct iOS build for latest Xcode beta.

ios/web/web_state/js/crw_js_early_script_manager_unittest.mm

Index: ios/web/web_state/js/crw_js_early_script_manager_unittest.mm
diff --git a/ios/web/web_state/js/crw_js_early_script_manager_unittest.mm b/ios/web/web_state/js/crw_js_early_script_manager_unittest.mm
index f0f2bfb2ab78d5118b48bf4f06070e167a3a12db..ff163b2ab7b4d5fb90fc77afa254642a418024a6 100644
--- a/ios/web/web_state/js/crw_js_early_script_manager_unittest.mm
+++ b/ios/web/web_state/js/crw_js_early_script_manager_unittest.mm
@@ -43,7 +43,12 @@ TEST_F(CRWJSEarlyScriptManagerTest, Content) {
   // |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