Revert of Add more components_unittests to GN build

components/json_schema/BUILD.gn

Index: components/json_schema/BUILD.gn
diff --git a/components/json_schema/BUILD.gn b/components/json_schema/BUILD.gn
index 4e7b4355974958f567a2830def649e601473b68a..8bcb7d52e62af3782ab062cc0bd5e962d3901a32 100644
--- a/components/json_schema/BUILD.gn
+++ b/components/json_schema/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("json_schema") {
+static_library("json_schema") {
   sources = [
     "json_schema_constants.cc",
     "json_schema_constants.h",
@@ -15,16 +15,3 @@
     "//third_party/re2",
   ]
 }
-
-source_set("unit_tests") {
-  testonly = true
-  sources = [
-    "json_schema_validator_unittest.cc",
-    "json_schema_validator_unittest_base.cc",
-    "json_schema_validator_unittest_base.h",
-  ]
-  deps = [
-    ":json_schema",
-    "//testing/gtest",
-  ]
-}