Revert of Add more components_unittests to GN build

components/error_page/renderer/BUILD.gn

Index: components/error_page/renderer/BUILD.gn
diff --git a/components/error_page/renderer/BUILD.gn b/components/error_page/renderer/BUILD.gn
index 83c49a173d455a6e11a0e4e798a18d9fc65c340b..bafaada3d30d11c59218f92eaf366e17b909adf0 100644
--- a/components/error_page/renderer/BUILD.gn
+++ b/components/error_page/renderer/BUILD.gn
@@ -2,7 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-source_set("renderer") {
+static_library("renderer") {
   sources = [
     "net_error_helper_core.cc",
     "net_error_helper_core.h",
@@ -20,14 +20,3 @@
     "//url",
   ]
 }
-
-source_set("unit_tests") {
-  testonly = true
-  sources = [
-    "net_error_helper_core_unittest.cc",
-  ]
-  deps = [
-    ":renderer",
-    "//testing/gtest",
-  ]
-}