Compile content_unittests service catalog directly into the binary

content/test/BUILD.gn

Index: content/test/BUILD.gn
diff --git a/content/test/BUILD.gn b/content/test/BUILD.gn
index 1fcd658f657421aeaefaed0f25c958cb3dfd1217..8ec7ac0441f4582146d87d8bacaffc34ca96fc66 100644
--- a/content/test/BUILD.gn
+++ b/content/test/BUILD.gn
@@ -1411,6 +1411,7 @@ test("content_unittests") {
 
   deps = [
     ":content_test_mojo_bindings",
+    ":content_unittests_catalog_source",
     ":test_support",
     "//base/test:test_support",
     "//base/third_party/dynamic_annotations",
@@ -1502,7 +1503,6 @@ test("content_unittests") {
   ]
 
   data_deps = [
-    ":content_unittests_catalog_copy",
     "//components/filesystem:filesystem",
     "//third_party/mesa:osmesa",
   ]
@@ -1757,14 +1757,9 @@ catalog("content_unittests_catalog") {
   embedded_services = [ ":content_unittests_manifest" ]
 }
 
-copy("content_unittests_catalog_copy") {
-  sources = get_target_outputs(":content_unittests_catalog")
-  outputs = [
-    "${root_out_dir}/content_unittests_catalog.json",
-  ]
-  deps = [
-    ":content_unittests_catalog",
-  ]
+catalog_cpp_source("content_unittests_catalog_source") {
+  catalog = ":content_unittests_catalog"
+  generated_function_name = "content::CreateContentUnittestsCatalog"
 }
 
 test("content_perftests") {