GN: Properly mark all NaCl test depencies as data_deps

ppapi/native_client/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
 import("//build/config/nacl/config.gni")
 
 if (is_nacl) {
   group("ppapi_lib") {
     deps = [
@@ skipping 78 matching lines @@
     args = [
       rebase_path(objcopy),
       rebase_path(irt_debug),
       rebase_path(irt_stripped),
       rebase_path(irt_final),
     ]
   }
 }
 
 group("irt") {
-  public_deps = [
+  data_deps = [
     ":nacl_irt_debug(//build/toolchain/nacl:irt_${target_cpu})",
     ":nacl_irt_debuglink(//build/toolchain/nacl:irt_${target_cpu})",
   ]
 
   # On 32-bit Windows, we also ship the 64-bit IRT.
   if (is_win && target_cpu == "x86") {
-    public_deps += [
+    data_deps += [
       ":nacl_irt_debug(//build/toolchain/nacl:irt_x64)",
       ":nacl_irt_debuglink(//build/toolchain/nacl:irt_x64)",
     ]
   }
 }