Use suffixed {uint,int}{8,16,32,64}_t types.

webrtc/base/x11windowpicker.h

 /*
  *  Copyright 2010 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 20 matching lines @@
   static bool IsDesktopElement(_XDisplay* display, Window window);
 
   bool Init() override;
   bool IsVisible(const WindowId& id) override;
   bool MoveToFront(const WindowId& id) override;
   bool GetWindowList(WindowDescriptionList* descriptions) override;
   bool GetDesktopList(DesktopDescriptionList* descriptions) override;
   bool GetDesktopDimensions(const DesktopId& id,
                             int* width,
                             int* height) override;
-  uint8* GetWindowIcon(const WindowId& id, int* width, int* height);
-  uint8* GetWindowThumbnail(const WindowId& id, int width, int height);
+  uint8_t* GetWindowIcon(const WindowId& id, int* width, int* height);
+  uint8_t* GetWindowThumbnail(const WindowId& id, int width, int height);
   int GetNumDesktops();
-  uint8* GetDesktopThumbnail(const DesktopId& id, int width, int height);
+  uint8_t* GetDesktopThumbnail(const DesktopId& id, int width, int height);
 
  private:
   scoped_ptr<XWindowEnumerator> enumerator_;
 };
 
 }  // namespace rtc
 
 #endif  // WEBRTC_BASE_LINUXWINDOWPICKER_H_