Removed dead ceiling function.

src/platform.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * 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
@@ skipping 75 matching lines @@
   return intgr;
 }
 
 #endif  // _MSC_VER < 1800
 
 #endif  // V8_CC_MSVC
 
 namespace v8 {
 namespace internal {
 
-double ceiling(double x);
 double modulo(double x, double y);
 
 // Custom implementation of math functions.
 double fast_sin(double input);
 double fast_cos(double input);
 double fast_tan(double input);
 double fast_log(double input);
 double fast_exp(double input);
 double fast_sqrt(double input);
 // The custom exp implementation needs 16KB of lookup data; initialize it
@@ skipping 485 matching lines @@
   char name_[kMaxThreadNameLength];
   int stack_size_;
   Semaphore* start_semaphore_;
 
   DISALLOW_COPY_AND_ASSIGN(Thread);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_PLATFORM_H_