Remove deprecated v8::base::OS::nan_value().

src/base/platform/platform-win32.cc

 // Copyright 2012 the V8 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.
 
 // Platform-specific code for Win32.
 
 // Secure API functions are not available using MinGW with msvcrt.dll
 // on Windows XP. Make sure MINGW_HAS_SECURE_API is not defined to
 // disable definition of secure API functions in standard headers that
 // would conflict with our own implementation.
@@ skipping 1144 matching lines @@
 #else  // __MINGW32__
 std::vector<OS::SharedLibraryAddress> OS::GetSharedLibraryAddresses() {
   return std::vector<OS::SharedLibraryAddress>();
 }
 
 
 void OS::SignalCodeMovingGC() { }
 #endif  // __MINGW32__
 
 
-double OS::nan_value() {
-  return std::numeric_limits<double>::quiet_NaN();
-}
-
-
 int OS::ActivationFrameAlignment() {
 #ifdef _WIN64
   return 16;  // Windows 64-bit ABI requires the stack to be 16-byte aligned.
 #elif defined(__MINGW32__)
   // With gcc 4.4 the tree vectorization optimizer can generate code
   // that requires 16 byte alignment such as movdqa on x86.
   return 16;
 #else
   return 8;  // Floating-point math runs faster with 8-byte alignment.
 #endif
@@ skipping 201 matching lines @@
   DCHECK(result);
 }
 
 
 
 void Thread::YieldCPU() {
   Sleep(0);
 }
 
 } }  // namespace v8::base