Remove 'char' from IDL

ppapi/c/ppb_gamepad.h

 /* Copyright (c) 2012 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.
  */
 
 /* From ppb_gamepad.idl modified Tue Apr 16 09:04:34 2013. */
 
 #ifndef PPAPI_C_PPB_GAMEPAD_H_
 #define PPAPI_C_PPB_GAMEPAD_H_
 
@@ skipping 46 matching lines @@
   /**
    * Identifier for the type of device/manufacturer.
    */
   uint16_t id[128];
   /**
    * Is there a gamepad connected at this index? If this is false, no other
    * data in this structure is valid.
    */
   PP_Bool connected;
   /* Padding to make the struct the same size between 64 and 32. */
-  char unused_pad_[4];
+  int8_t unused_pad_[4];
 };
 PP_COMPILE_ASSERT_STRUCT_SIZE_IN_BYTES(PP_GamepadSampleData, 472);
 
 /**
  * The data for all gamepads connected to the system.
  */
 struct PP_GamepadsSampleData {
   /**
    * Number of valid elements in the |items| array.
    */
   uint32_t length;
   /* Padding to make the struct the same size between 64 and 32. */
-  char unused_pad_[4];
+  int8_t unused_pad_[4];
   /**
    * Data for an individual gamepad device connected to the system.
    */
   struct PP_GamepadSampleData items[4];
 };
 PP_COMPILE_ASSERT_STRUCT_SIZE_IN_BYTES(PP_GamepadsSampleData, 1896);
 /**
  * @}
  */
 
@@ skipping 12 matching lines @@
   void (*Sample)(PP_Instance instance, struct PP_GamepadsSampleData* data);
 };
 
 typedef struct PPB_Gamepad_1_0 PPB_Gamepad;
 /**
  * @}
  */
 
 #endif  /* PPAPI_C_PPB_GAMEPAD_H_ */