add missing dependency

testing/gtest.gyp

Index: testing/gtest.gyp
diff --git a/testing/gtest.gyp b/testing/gtest.gyp
index cecd93698d1e45f25e9ac2df2dcbcd2fc5d6d0ea..45f437ac1dee70ee8bf2335d1eacc79175a4fbba 100644
--- a/testing/gtest.gyp
+++ b/testing/gtest.gyp
@@ -17,7 +17,6 @@
         'gtest/include/gtest/gtest-typed-test.h',
         'gtest/include/gtest/gtest.h',
         'gtest/include/gtest/gtest_pred_impl.h',
-        'gtest/include/gtest/gtest_prod.h',
         'gtest/include/gtest/internal/gtest-death-test-internal.h',
         'gtest/include/gtest/internal/gtest-filepath.h',
         'gtest/include/gtest/internal/gtest-internal.h',
@@ -48,6 +47,9 @@
         'gtest',
         'gtest/include',
       ],
+      'dependencies': [
+        'gtest_prod',
+      ],
       'conditions': [
         ['OS == "mac"', {
           'sources': [
@@ -130,5 +132,13 @@
         'gtest/src/gtest_main.cc',
       ],
     },
+    {
+      'target_name': 'gtest_prod',
+      'toolsets': ['host', 'target'],
+      'type': 'none',
+      'sources': [
+        'gtest/include/gtest/gtest_prod.h',
+      ],
+    },
   ],
 }