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

test/cctest/test-debug.cc

 // Copyright 2007-2008 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 353 matching lines @@
 
 
 // Prepare to step to next break location.
 static void PrepareStep(StepAction step_action) {
   Debug::PrepareStep(step_action, 1);
 }
 
 
 // This function is in namespace v8::internal to be friend with class
 // v8::internal::Debug.
-namespace v8 { namespace internal {  // NOLINT
+namespace v8 {
+namespace internal {
 
 // Collect the currently debugged functions.
 Handle<FixedArray> GetDebuggedFunctions() {
   v8::internal::DebugInfoListNode* node = Debug::debug_info_list_;
 
   // Find the number of debugged functions.
   int count = 0;
   while (node) {
     count++;
     node = node->next();
@@ skipping 4605 matching lines @@
   v8::Local<v8::Function> f =
       v8::Local<v8::Function>::Cast(env->Global()->Get(v8::String::New("f")));
   f->Call(env->Global(), 0, NULL);
 
   // Setting message handler to NULL should cause debugger unload.
   v8::Debug::SetMessageHandler2(NULL);
   CheckDebuggerUnloaded();
 
   CHECK_EQ(1, exception_event_count);
 }