Change device IDs from unsigned to signed.

ui/views/widget/desktop_aura/desktop_window_tree_host_x11_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <vector>
 
 #include <X11/extensions/shape.h>
 #include <X11/Xlib.h>
 
 // Get rid of X11 macros which conflict with gtest.
@@ skipping 505 matching lines @@
     }
     DesktopWindowTreeHostX11::g_current_capture = capture_host;
     if (capture_widget)
       capture_widget->GetNativeWindow()->SetCapture();
   }
 
  private:
   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);
 
     DesktopWindowTreeHostX11Test::SetUp();
   }
 
   CustomX11EventSource event_source_;
   DISALLOW_COPY_AND_ASSIGN(DesktopWindowTreeHostX11HighDPITest);
 };
 
@@ skipping 46 matching lines @@
   EXPECT_EQ(ui::ET_MOUSEWHEEL, second_recorder.mouse_events()[0].type());
   EXPECT_EQ(gfx::Point(-25, -25).ToString(),
             second_recorder.mouse_events()[0].location().ToString());
 
   PretendCapture(nullptr);
   first.GetNativeWindow()->RemovePreTargetHandler(&first_recorder);
   second.GetNativeWindow()->RemovePreTargetHandler(&second_recorder);
 }
 
 }  // namespace views