Revert of Content "gn check" work.

content/browser/BUILD.gn

Index: content/browser/BUILD.gn
diff --git a/content/browser/BUILD.gn b/content/browser/BUILD.gn
index fcd1572500ebb9a41adeb7d9374e67c0014ccf4a..9245309c446ae1210785fe541c47b04c666a6d82 100644
--- a/content/browser/BUILD.gn
+++ b/content/browser/BUILD.gn
@@ -11,10 +11,7 @@
 source_set("browser") {
   # Only the public target should depend on this. All other targets (even
   # internal content ones) should depend on the public one.
-  visibility = [
-    ":for_content_tests",
-    "//content/public/browser:browser_sources",
-  ]
+  visibility = [ "//content/public/browser:browser_sources" ]
 
   configs += [
     "//build/config:precompiled_headers",
@@ -529,16 +526,6 @@
   }
 }
 
-# See comment at the top of //content/BUILD.gn for how this works.
-group("for_content_tests") {
-  visibility = [ "//content/test/*" ]
-  if (!is_component_build) {
-    public_deps = [
-      ":browser",
-    ]
-  }
-}
-
 mojo_application_manifest("chrome_manifest") {
   type = "exe"
   application_name = "chrome"