[googletest] Reference SDK parts when building with the SDK.

Change-Id: I8deecb7c580e100f49c80c86554170b306d01dd0
diff --git a/BUILD.gn b/BUILD.gn
index f15ef60..50d1ab2 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -2,6 +2,8 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//build/fuchsia/sdk.gni")
+
 config("gtest_private_config") {
   visibility = [ ":*" ]
   include_dirs = [ "googletest" ]
@@ -14,8 +16,8 @@
 static_library("gtest") {
   testonly = true
   public = [
-    "googletest/include/gtest/gtest.h",
     "googletest/include/gtest/gtest-spi.h",
+    "googletest/include/gtest/gtest.h",
   ]
   sources = [
     "googletest/include/gtest/gtest-death-test.h",
@@ -56,10 +58,17 @@
   configs += [ ":gtest_private_config" ]
 
   if (is_fuchsia) {
-    deps = [
-      "//zircon/public/lib/fdio",
-      "//zircon/public/lib/zx",
-    ]
+    if (using_fuchsia_sdk) {
+      deps = [
+        "$fuchsia_sdk_root/pkg:fdio",
+        "$fuchsia_sdk_root/pkg:zx",
+      ]
+    } else {
+      deps = [
+        "//zircon/public/lib/fdio",
+        "//zircon/public/lib/zx",
+      ]
+    }
   }
 }