update_engine: Update libchrome APIS to r456626.
The new libchrome has been ported from Chromium and some APIs
have changed. Make necessary changes at call sites.
BUG=chromium:724678
CQ-DEPEND=CL:480928
Test: Build.
Change-Id: I01b70da87521d0884ed21acbd7ed3e0ff1e94357
Merged-In: I4dbaea4a2a19031375a8bf2415645a4f226dab57
diff --git a/common/test_utils.cc b/common/test_utils.cc
index e410283..85f78f9 100644
--- a/common/test_utils.cc
+++ b/common/test_utils.cc
@@ -256,7 +256,7 @@
string* mnt_path,
unsigned long flags) { // NOLINT - long
EXPECT_TRUE(temp_dir_.CreateUniqueTempDir());
- *mnt_path = temp_dir_.path().value();
+ *mnt_path = temp_dir_.GetPath().value();
string loop_dev;
loop_binder_.reset(