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

components/storage_monitor/storage_monitor_win_unittest.cc

Index: components/storage_monitor/storage_monitor_win_unittest.cc
diff --git a/components/storage_monitor/storage_monitor_win_unittest.cc b/components/storage_monitor/storage_monitor_win_unittest.cc
index 84eb51e553ad78aaff54ae531526d9b9a8b8ea9e..f146cfc7b4e749314fd73aaf686b32ba70a5b31f 100644
--- a/components/storage_monitor/storage_monitor_win_unittest.cc
+++ b/components/storage_monitor/storage_monitor_win_unittest.cc
@@ -295,7 +295,7 @@ TEST_F(StorageMonitorWinTest, DevicesAttached) {
 
 TEST_F(StorageMonitorWinTest, PathMountDevices) {
   PreAttachDevices();
-  int init_storages = monitor_->GetAllAvailableStorages().size();
+  size_t init_storages = monitor_->GetAllAvailableStorages().size();
 
   volume_mount_watcher_->AddDeviceForTesting(
       base::FilePath(FILE_PATH_LITERAL("F:\\mount1")),
@@ -475,7 +475,7 @@ TEST_F(StorageMonitorWinTest, DeviceInfoForPath) {
   EXPECT_EQ(info.device_id(), device_info.device_id());
   EXPECT_EQ(info.GetDisplayName(false), device_info.GetDisplayName(false));
   EXPECT_EQ(info.location(), device_info.location());
-  EXPECT_EQ(1000000, info.total_size_in_bytes());
+  EXPECT_EQ(1000000u, info.total_size_in_bytes());
 
   // A fixed device.
   base::FilePath fixed_device(L"N:\\");