Split the //mojo/public/cpp/test_support:test_utils target.

mojo/public/cpp/bindings/tests/BUILD.gn

Index: mojo/public/cpp/bindings/tests/BUILD.gn
diff --git a/mojo/public/cpp/bindings/tests/BUILD.gn b/mojo/public/cpp/bindings/tests/BUILD.gn
index a9ebeacc996c0385f73ce7cad291da508fb9cb04..e04a655b458945fb2647501031f6f7b925b61624 100644
--- a/mojo/public/cpp/bindings/tests/BUILD.gn
+++ b/mojo/public/cpp/bindings/tests/BUILD.gn
@@ -49,6 +49,7 @@ mojo_sdk_source_set("tests") {
     "mojo/public/cpp/bindings:callback",
     "mojo/public/cpp/environment:standalone",
     "mojo/public/cpp/system",
+    "mojo/public/cpp/test_support",
     "mojo/public/cpp/test_support:test_utils",
     "mojo/public/cpp/utility",
     "mojo/public/interfaces/bindings/tests:test_interfaces",
@@ -71,7 +72,7 @@ mojo_sdk_source_set("perftests") {
     "mojo/public/cpp/bindings:callback",
     "mojo/public/cpp/environment:standalone",
     "mojo/public/cpp/system",
-    "mojo/public/cpp/test_support:test_utils",
+    "mojo/public/cpp/test_support",
     "mojo/public/cpp/utility",
     "mojo/public/interfaces/bindings/tests:test_interfaces",
   ]
@@ -117,7 +118,9 @@ if (mojo_use_application_in_sdk) {
     deps = [
       ":versioning_apptest_source_set",
     ]
-    data_deps = [ ":versioning_test_service" ]
+    data_deps = [
+      ":versioning_test_service",
+    ]
   }
 
   mojo_sdk_source_set("versioning_apptest_source_set") {