ui: Fix the path of DIR_TEST_DATA key.

ui/base/resource/data_pack_unittest.cc

Index: ui/base/resource/data_pack_unittest.cc
diff --git a/ui/base/resource/data_pack_unittest.cc b/ui/base/resource/data_pack_unittest.cc
index 1840d7095093ee9feaa005caa5733c9b77c55999..e04ad8dd9d90522ab192860ec33d71f15a37b88b 100644
--- a/ui/base/resource/data_pack_unittest.cc
+++ b/ui/base/resource/data_pack_unittest.cc
@@ -9,6 +9,7 @@
 #include "base/path_service.h"
 #include "base/strings/string_piece.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include "ui/base/ui_base_paths.h"
 #include "ui/base/resource/data_pack.h"
 
 namespace ui {
@@ -98,9 +99,8 @@ INSTANTIATE_TEST_CASE_P(WriteUTF16, DataPackTest, ::testing::Values(
 
 TEST(DataPackTest, LoadFileWithTruncatedHeader) {
   base::FilePath data_path;
-  PathService::Get(base::DIR_SOURCE_ROOT, &data_path);
-  data_path = data_path.Append(FILE_PATH_LITERAL(
-      "ui/base/test/data/data_pack_unittest/truncated-header.pak"));
+  ASSERT_TRUE(PathService::Get(DIR_TEST_DATA, &data_path));
+  data_path = data_path.AppendASCII("data_pack_unittest/truncated-header.pak");
 
   DataPack pack(SCALE_FACTOR_100P);
   ASSERT_FALSE(pack.LoadFromPath(data_path));