Fix 'gn check' errors for 'ppapi' folder

Bug: 1158998
Change-Id: I1c4a31d3bf415d8720c6dde519fd9d01c92ba9d9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2983299
Auto-Submit: Andrew Shulaev <ddrone@google.com>
Reviewed-by: Bill Budge <bbudge@chromium.org>
Reviewed-by: Erik Staab <estaab@chromium.org>
Commit-Queue: Erik Staab <estaab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#895700}

.gn

@@ -69,7 +69,6 @@ no_check_targets = [
   "//ppapi/native_client/src/untrusted/pnacl_irt_shim:*",  # 197 errors
   "//ppapi/proxy:*",  # 31 errors
   "//ppapi/thunk:*",  # 1071 errors
-  "//ppapi:*",  # 3 errors
   "//remoting/host/installer/mac:*",  # 1 error
   "//remoting/host/mac:*",  # 49 errors
   "//remoting/host/security_key:*",  # 68 errors

ppapi/BUILD.gn

@@ -118,6 +118,7 @@ test_common_source_files = [
   "tests/test_url_loader.h",
   "tests/test_url_request.cc",
   "tests/test_url_request.h",
+  "tests/test_utils.h",
   "tests/test_utils.cc",
   "tests/test_var.cc",
   "tests/test_var.h",
@@ -225,6 +226,7 @@ source_set("corb_test_plugin_sources") {
   sources = [
     "tests/corb_test_plugin.cc",
     "tests/test_utils.cc",
+    "tests/test_utils.h",
   ]
 
   deps = [
@@ -397,7 +399,10 @@ if (enable_nacl) {
         "GL_GLEXT_PROTOTYPES",
         "PPAPI_TEST_IMPLEMENTATION",
       ]
-      deps = [ "//ppapi/cpp" ]
+      deps = [
+        "//ppapi/cpp",
+        "//ppapi/native_client/src/untrusted/irt_stub:ppapi_stub_lib",
+      ]
       if (current_cpu == "pnacl") {
         pretranslate_pexe = true
       }