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 4a6c87dbe6fde5f062406fda1cdbd4b39c57d375..63c8ed391ce65f0b3729baf94c346c5bf06232e8 100644
--- a/components/BUILD.gn
+++ b/components/BUILD.gn
@@ -12,15 +12,6 @@ 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
 # component (it's important to use a source_set instead of a static library or
 # no tests will run) and add a reference here. You can add more than one unit
@@ -326,15 +317,6 @@ if (is_android) {
   }
 }
 
-# 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" ]