replace COMPILE_ASSERT with static_assert in public/platform/

public/platform/WebGamepad.h

 // Copyright (C) 2011, Google Inc. All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are met:
 //
 // 1. Redistributions of source code must retain the above copyright
 //    notice, this list of conditions and the following disclaimer.
 // 2. Redistributions in binary form must reproduce the above copyright
 //    notice, this list of conditions and the following disclaimer in the
 //    documentation and/or other materials provided with the distribution.
@@ skipping 79 matching lines @@
     unsigned buttonsLength;
 
     // Button states
     WebGamepadButton buttons[buttonsLengthCap];
 
     // Mapping type (for example "standard")
     WebUChar mapping[mappingLengthCap];
 };
 
 #if BLINK_IMPLEMENTATION
-COMPILE_ASSERT(sizeof(WebGamepad) == 721, WebGamepad_has_wrong_size);
+static_assert(sizeof(WebGamepad) == 721, "WebGamepad has wrong size");
 #endif
 
 #pragma pack(pop)
 
 }
 
 #endif // WebGamepad_h