Mojo C++ binding: make device/usb mojom targets use STD string/vector types

device/usb/mojo/device_manager_impl_unittest.cc

Index: device/usb/mojo/device_manager_impl_unittest.cc
diff --git a/device/usb/mojo/device_manager_impl_unittest.cc b/device/usb/mojo/device_manager_impl_unittest.cc
index a8d24c8f1ff5b58f7c27010cbc7b7915710ac768..4987fe73bdffc7ee070c19725e0dafdafc048e50 100644
--- a/device/usb/mojo/device_manager_impl_unittest.cc
+++ b/device/usb/mojo/device_manager_impl_unittest.cc
@@ -85,7 +85,7 @@ class MockDeviceManagerClient : public DeviceManagerClient {
 
 void ExpectDevicesAndThen(const std::set<std::string>& expected_guids,
                           const base::Closure& continuation,
-                          mojo::Array<DeviceInfoPtr> results) {
+                          std::vector<DeviceInfoPtr> results) {
   EXPECT_EQ(expected_guids.size(), results.size());
   std::set<std::string> actual_guids;
   for (size_t i = 0; i < results.size(); ++i)
@@ -121,10 +121,11 @@ TEST_F(USBDeviceManagerImplTest, GetDevices) {
   DeviceManagerPtr device_manager = ConnectToDeviceManager();
 
   EnumerationOptionsPtr options = EnumerationOptions::New();
-  options->filters = mojo::Array<DeviceFilterPtr>::New(1);
-  options->filters[0] = DeviceFilter::New();
-  options->filters[0]->has_vendor_id = true;
-  options->filters[0]->vendor_id = 0x1234;
+  auto filter = DeviceFilter::New();
+  filter->has_vendor_id = true;
+  filter->vendor_id = 0x1234;
+  options->filters.emplace();

[dcheng, 2016/08/15 18:18:15]

?

Isn't option->filters a vector here? How does a call to emplace() with no
arguments work?

[Reilly Grant (use Gerrit), 2016/08/15 21:39:02]

option->filters is a base::Optional<std::vector<>>. Calling emplace() runs the
std::vector<> constructor so that the ->push_back() call on the next line is
valid.

+  options->filters->push_back(std::move(filter));
 
   std::set<std::string> guids;
   guids.insert(device0->guid());