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

src/runtime.cc

 // Copyright 2006-2009 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 28 matching lines @@
 #include "debug.h"
 #include "execution.h"
 #include "jsregexp.h"
 #include "platform.h"
 #include "runtime.h"
 #include "scopeinfo.h"
 #include "v8threads.h"
 #include "smart-pointer.h"
 #include "parser.h"
 
-namespace v8 { namespace internal {
+namespace v8 {
+namespace internal {
 
 
 #define RUNTIME_ASSERT(value) do {                                   \
   if (!(value)) return IllegalOperation();                           \
 } while (false)
 
 // Cast the given object to a value of the specified type and store
 // it in a variable with the given name.  If the object is not of the
 // expected type call IllegalOperation and return.
 #define CONVERT_CHECKED(Type, name, obj)                             \
@@ skipping 6977 matching lines @@
   } else {
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     Counters::gc_last_resort_from_js.Increment();
     Heap::CollectAllGarbage();
   }
 }
 
 
 } }  // namespace v8::internal