Revert of Move gn _run target generation into test().

components/BUILD.gn

Index: components/BUILD.gn
diff --git a/components/BUILD.gn b/components/BUILD.gn
index 63c8ed391ce65f0b3729baf94c346c5bf06232e8..4a6c87dbe6fde5f062406fda1cdbd4b39c57d375 100644
--- a/components/BUILD.gn
+++ b/components/BUILD.gn
@@ -10,6 +10,15 @@
 
 if (is_android) {
   import("//build/config/android/rules.gni")
+}
+
+# TODO(GYP): Delete this after we've converted everything to GN.
+# The _run targets exist only for compatibility w/ GYP.
+group("components_unittests_run") {
+  testonly = true
+  deps = [
+    ":components_unittests",
+  ]
 }
 
 # To add a unit test to this target, make a "unit_test" source_set in your
@@ -317,6 +326,15 @@
   }
 }
 
+# TODO(GYP): Delete this after we've converted everything to GN.
+# The _run targets exist only for compatibility w/ GYP.
+group("components_browsertests_run") {
+  testonly = true
+  deps = [
+    ":components_browsertests",
+  ]
+}
+
 test("components_browsertests") {
   sources = []
   defines = [ "HAS_OUT_OF_PROC_TEST_RUNNER" ]