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/manager.cc b/manager.cc
index e390d61..103d8ec 100644
--- a/manager.cc
+++ b/manager.cc
@@ -61,7 +61,7 @@
   scoped_ptr<Service> service(new Service(this, service_identifier_++));
 
   service->RegisterAsync(
-      dbus_object_->GetObjectManager().get(), bus_, sequencer);
+      dbus_object_->GetObjectManager().get(), bus_, sequencer.get());
   sequencer->OnAllTasksCompletedCall({
       base::Bind(&Manager::OnServiceRegistered,
                  base::Unretained(this),
@@ -112,7 +112,7 @@
   scoped_refptr<AsyncEventSequencer> sequencer(new AsyncEventSequencer());
   device->RegisterAsync(dbus_object_->GetObjectManager().get(),
                         bus_,
-                        sequencer,
+                        sequencer.get(),
                         device_identifier_++);
   sequencer->OnAllTasksCompletedCall({
     base::Bind(&Manager::OnDeviceRegistered,