Update libchrome to r307740 and fix build errors

Updated libchrome, libchrome_crypto, metrics, feedback to the
latest revisions from Chrome (r307740).

Fixed build breaks due to the changes in upstream code:

- scope_ptr no longer needs explicit PassAs<T>() calls.
- scope_ptr<T> no longer has implicit conversion to T*.
  Must use scope_ptr<T>::get() instead.
- base/file_util.h moved to base/files/file_util.h
- ARRAYSIZE_UNSAFE() removed in favor of arraysize()
- base::AppendToFile() and base::WriteFileDescriptor() now
  return bool instead of the number of bytes written.
- dbus::Bus::AddFilterFunction() now returns void.
- C++11 features are enabled in libchromeos, so all targets
  linking with it now have to support C++11
- OVERRIDE macro is removed in favor of native C++11
  'override' keyword.

BUG=chromium:416628, chromium:411508
TEST=Build the world on x86, x64, ARM. The following builders
     were tried:
       x86-generic-full amd64-generic-full arm-generic-full
       amd64-generic-asan daisy-full nyan-full pre-cq-group
       daisy-release-group sandybridge-release-group
       pineview-release-group
CQ-DEPEND=CL:234450,CL:234980

Change-Id: I374bebe2211d533c4431c82efb8be1cdcb1f405d
Reviewed-on: https://chromium-review.googlesource.com/234440
Reviewed-by: Bertrand Simonnet <bsimonnet@chromium.org>
Tested-by: Alex Vakulenko <avakulenko@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Alex Vakulenko <avakulenko@chromium.org>
diff --git a/update_manager/chromeos_policy_unittest.cc b/update_manager/chromeos_policy_unittest.cc
index 34d8150..5905437 100644
--- a/update_manager/chromeos_policy_unittest.cc
+++ b/update_manager/chromeos_policy_unittest.cc
@@ -172,8 +172,8 @@
     string error = "<None>";
     eval_ctx_->ResetEvaluation();
     EXPECT_EQ(expected,
-              (policy_.*policy_method)(eval_ctx_, &fake_state_, &error, result,
-                                       args...))
+              (policy_.*policy_method)(eval_ctx_.get(), &fake_state_, &error,
+                                       result, args...))
         << "Returned error: " << error
         << "\nEvaluation context: " << eval_ctx_->DumpContext();
   }