Add FilePath to base namespace.

chromeos/chromeos_test_utils.cc

Index: chromeos/chromeos_test_utils.cc
diff --git a/chromeos/chromeos_test_utils.cc b/chromeos/chromeos_test_utils.cc
index 3455644aeab9fd83e2c25d3f34dc50879667cb34..90ee92a93680067d5ddb0e2fff23656327590269 100644
--- a/chromeos/chromeos_test_utils.cc
+++ b/chromeos/chromeos_test_utils.cc
@@ -13,8 +13,8 @@ namespace test_utils {
 
 bool GetTestDataPath(const std::string& component,
                      const std::string& filename,
-                     FilePath* data_dir) {
-  FilePath path;
+                     base::FilePath* data_dir) {
+  base::FilePath path;
   if (!PathService::Get(base::DIR_SOURCE_ROOT, &path))
     return false;
   path = path.Append(FILE_PATH_LITERAL("chromeos"));