Rename XCTests test main target and output.

ios/BUILD.gn

 # 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.
 
 assert(!is_component_build, "component build is unsupported on iOS")
 
 declare_args() {
   # Control whether cronet is build (this is usually set by the script
   # components/cronet/tools/cr_cronet.py as cronet requires specific
   # gn args to build correctly).
@@ skipping 23 matching lines @@
       "//ios/chrome/today_extension:packed_resources",
       "//ios/net:ios_net_unittests",
       "//ios/public/provider/chrome/browser",
       "//ios/public/provider/web",
       "//ios/testing:ocmock_support_unittest",
       "//ios/third_party/earl_grey",
       "//ios/web:earl_grey_test_support",
       "//ios/web:ios_web_inttests",
       "//ios/web:ios_web_unittests",
       "//ios/web/shell:ios_web_shell",
-      "//ios/web/shell/test:ios_web_shell_test_host",
+      "//ios/web/shell/test:ios_web_shell_test",
     ]
   }
 }