Remove the //ios/public/test target.

ios/provider/ios_provider_chrome.gyp

Index: ios/provider/ios_provider_chrome.gyp
diff --git a/ios/provider/ios_provider_chrome.gyp b/ios/provider/ios_provider_chrome.gyp
index d11ac595756bf87b296d7d61e33dacd8e4c025e4..e552221df170069311dd63e77ec08d50d7cccc16 100644
--- a/ios/provider/ios_provider_chrome.gyp
+++ b/ios/provider/ios_provider_chrome.gyp
@@ -44,5 +44,24 @@
         'ios_provider_web.gyp:ios_provider_web',
       ],
     },
+    {
+      # GN version: //ios/public/provider/chrome/browser:test_support
+      'target_name': 'ios_provider_chrome_browser_test_support',
+      'type': 'static_library',
+      'sources': [
+        '../public/provider/chrome/browser/test_chrome_browser_provider.h',
+        '../public/provider/chrome/browser/test_chrome_browser_provider.mm',
+        '../public/provider/chrome/browser/test_chrome_provider_initializer.cc',
+        '../public/provider/chrome/browser/test_chrome_provider_initializer.h',
+        '../public/provider/chrome/browser/test_updatable_resource_provider.h',
+        '../public/provider/chrome/browser/test_updatable_resource_provider.mm',
+      ],
+      'dependencies': [
+        '../../base/base.gyp:base',
+        '../../components/components.gyp:signin_ios_browser_test_support',
+        '../../testing/gtest.gyp:gtest',
+        'ios_provider_chrome_browser',
+      ],
+    },
   ],
 }