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

src/debug.cc

 // 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 26 matching lines @@
 #include "execution.h"
 #include "global-handles.h"
 #include "ic.h"
 #include "ic-inl.h"
 #include "natives.h"
 #include "stub-cache.h"
 #include "log.h"
 
 #include "../include/v8-debug.h"
 
-namespace v8 { namespace internal {
+namespace v8 {
+namespace internal {
 
 #ifdef ENABLE_DEBUGGER_SUPPORT
 static void PrintLn(v8::Local<v8::Value> value) {
   v8::Local<v8::String> s = value->ToString();
   char* data = NewArray<char>(s->Length() + 1);
   if (data == NULL) {
     V8::FatalProcessOutOfMemory("PrintLn");
     return;
   }
   s->WriteAscii(data);
@@ skipping 2465 matching lines @@
 
 
 void LockingCommandMessageQueue::Clear() {
   ScopedLock sl(lock_);
   queue_.Clear();
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 } }  // namespace v8::internal