Componentize component_updater: Move a bunch of tests to component.

components/component_updater/BUILD.gn

Index: components/component_updater/BUILD.gn
diff --git a/components/component_updater/BUILD.gn b/components/component_updater/BUILD.gn
index d57bbf4366c4340e9877233fa70abb28495e4fe4..8e2c8f23b043c77674f60fc603d120ce15b82265 100644
--- a/components/component_updater/BUILD.gn
+++ b/components/component_updater/BUILD.gn
@@ -50,3 +50,38 @@ source_set("component_updater") {
     "//ui/base",
   ]
 }
+
+static_library("test_support") {
+  sources = [
+    "test/test_configurator.cc",
+    "test/test_configurator.h",
+    "test/test_installer.cc",
+    "test/test_installer.h",
+    "test/url_request_post_interceptor.cc",
+    "test/url_request_post_interceptor.h",
+  ]
+
+  deps = [
+    ":component_updater",
+    "//testing/gtest",
+    "//testing/gmock",
+  ]
+}
+
+source_set("unit_tests") {
+  sources = [
+    "test/component_patcher_unittest.cc",
+    "test/component_updater_ping_manager_unittest.cc",
+    "test/crx_downloader_unittest.cc",
+    "test/update_checker_unittest.cc",
+    "test/update_response_unittest.cc",
+  ]
+
+  deps = [
+    ":component_updater",
+    ":test_support",
+    "//testing/gtest",
+    "//testing/gmock",
+    "//third_party/libxml",
+  ]
+}