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

src/v8.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 55 matching lines @@
 
 // Objects & heap
 #include "objects.h"
 #include "spaces.h"
 #include "heap.h"
 #include "objects-inl.h"
 #include "spaces-inl.h"
 #include "heap-inl.h"
 #include "messages.h"
 
-namespace v8 { namespace internal {
+namespace v8 {
+namespace internal {
 
 class V8 : public AllStatic {
  public:
   // Global actions.
 
   // If Initialize is called with des == NULL, the
   // initial state is created from scratch. If a non-null Deserializer
   // is given, the initial state is created by reading the
   // deserialized data into an empty heap.
   static bool Initialize(Deserializer* des);
   static void TearDown();
   static bool HasBeenSetup() { return has_been_setup_; }
   static bool HasBeenDisposed() { return has_been_disposed_; }
 
   // Report process out of memory. Implementation found in api.cc.
   static void FatalProcessOutOfMemory(const char* location);
  private:
   static bool has_been_setup_;
   static bool has_been_disposed_;
 };
 
 } }  // namespace v8::internal
 
 namespace i = v8::internal;
 
 #endif  // V8_V8_H_