Split nested namespaces declaration in two lines in accordance with C++ Style Guide.

src/conversions-inl.h

 // Copyright 2006-2008 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 20 matching lines @@
 #include <math.h>
 #include <float.h>         // required for DBL_MAX and on Win32 for finite()
 #include <stdarg.h>
 
 // ----------------------------------------------------------------------------
 // Extra POSIX/ANSI functions for Win32/MSVC.
 
 #include "conversions.h"
 #include "platform.h"
 
-namespace v8 { namespace internal {
+namespace v8 {
+namespace internal {
 
 // The fast double-to-int conversion routine does not guarantee
 // rounding towards zero.
 static inline int FastD2I(double x) {
 #ifdef __USE_ISOC99
   // The ISO C99 standard defines the lrint() function which rounds a
   // double to an integer according to the current rounding direction.
   return lrint(x);
 #else
   // This is incredibly slow on Intel x86. The reason is that rounding
@@ skipping 33 matching lines @@
   if (!isfinite(x) || x == 0) return 0;
   if (x < 0 || x >= two32) x = fmod(x, two32);
   x = (x >= 0) ? floor(x) : ceil(x) + two32;
   return (int32_t) ((x >= two31) ? x - two32 : x);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_CONVERSIONS_INL_H_