clang/win: Let remaining chromium_code targets build with -Wextra.

device/bluetooth/bluetooth_device_win_unittest.cc

Index: device/bluetooth/bluetooth_device_win_unittest.cc
diff --git a/device/bluetooth/bluetooth_device_win_unittest.cc b/device/bluetooth/bluetooth_device_win_unittest.cc
index c9d48a38652ed63fdb5312f86c6ac33aa4f8844b..0fb9d323c1926e1f8bc7b7af6963964ebabcb06b 100644
--- a/device/bluetooth/bluetooth_device_win_unittest.cc
+++ b/device/bluetooth/bluetooth_device_win_unittest.cc
@@ -86,12 +86,12 @@ class BluetoothDeviceWinTest : public testing::Test {
 TEST_F(BluetoothDeviceWinTest, GetUUIDs) {
   BluetoothDevice::UUIDList uuids = device_->GetUUIDs();
 
-  EXPECT_EQ(2, uuids.size());
+  EXPECT_EQ(2u, uuids.size());
   EXPECT_EQ(kTestAudioSdpUuid, uuids[0]);
   EXPECT_EQ(kTestVideoSdpUuid, uuids[1]);
 
   uuids = empty_device_->GetUUIDs();
-  EXPECT_EQ(0, uuids.size());
+  EXPECT_EQ(0u, uuids.size());
 }
 
 TEST_F(BluetoothDeviceWinTest, IsEqual) {