metrics: Update to build against libchrome-271506

BUG=chromium:375032
TEST=`FEATURES=test emerge-$BOARD platform2`
TEST=Trybot runs on paladin, release, and chromiumos-sdk builders.

Change-Id: Icb524d3fd4001ebc36edc84306ea70db70f7599b
Reviewed-on: https://chromium-review.googlesource.com/200519
Reviewed-by: Luigi Semenzato <semenzato@chromium.org>
Reviewed-by: Daniel Erat <derat@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Ben Chan <benchan@chromium.org>
Commit-Queue: Ben Chan <benchan@chromium.org>
diff --git a/metrics/metrics_library_test.cc b/metrics/metrics_library_test.cc
index f6cd7e7..377495f 100644
--- a/metrics/metrics_library_test.cc
+++ b/metrics/metrics_library_test.cc
@@ -70,9 +70,9 @@
                                     buffer,
                                     1,
                                     &result));
-  ASSERT_TRUE(file_util::WriteFile(base::FilePath(kTestMounts),
-                                   kTestContents,
-                                   strlen(kTestContents)));
+  ASSERT_TRUE(base::WriteFile(base::FilePath(kTestMounts),
+                              kTestContents,
+                              strlen(kTestContents)));
   EXPECT_FALSE(lib_.IsDeviceMounted("guestfs",
                                     kTestMounts,
                                     buffer,