Fix config visibility violation in //testing/gmock

This is a port of the following 2 CL on Chromium:
https://crrev.com/c/3139927
https://crrev.com/c/2672580

Bug: gn:252
Change-Id: I7c0636fad9d9f07c73e5f77b9b0a342d0326800f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3145613Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#76725}

testing/gmock/BUILD.gn

@@ -15,12 +15,7 @@ source_set("gmock") {
     "include/gmock/gmock-matchers.h",
     "include/gmock/gmock.h",
   ]
-  deps = [ "//third_party/googletest:gmock" ]
-
-  public_configs = [
-    "//third_party/googletest:gmock_config",
-    "//third_party/googletest:gtest_config",
-  ]
+  public_deps = [ "//third_party/googletest:gmock" ]
 }
 
 # The file/directory layout of Google Test is not yet considered stable. Until