Change device IDs from unsigned to signed.

ui/views/widget/desktop_aura/desktop_window_tree_host_x11_unittest.cc

Index: ui/views/widget/desktop_aura/desktop_window_tree_host_x11_unittest.cc
diff --git a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11_unittest.cc b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11_unittest.cc
index 38aa0c872d8af06486134e21e859325ea953b1a9..17eb63a8e798b8af8e91c79b991192c0a37ebdbd 100644
--- a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11_unittest.cc
+++ b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11_unittest.cc
@@ -523,7 +523,7 @@ class DesktopWindowTreeHostX11HighDPITest
   void SetUp() override {
     base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
     command_line->AppendSwitchASCII(switches::kForceDeviceScaleFactor, "2");
-    std::vector<unsigned int> pointer_devices;
+    std::vector<int> pointer_devices;
     pointer_devices.push_back(kPointerDeviceId);
     ui::TouchFactory::GetInstance()->SetPointerDeviceForTest(pointer_devices);