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

src/messages.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 18 matching lines @@
 //
 // Note: there's a big unresolved issue about ownership of the data
 // structures used by this framework.
 
 #ifndef V8_MESSAGES_H_
 #define V8_MESSAGES_H_
 
 #include "handles-inl.h"
 
 // Forward declaration of MessageLocation.
-namespace v8 { namespace internal {
+namespace v8 {
+namespace internal {
 class MessageLocation;
 } }  // namespace v8::internal
 
 
 class V8Message {
  public:
   V8Message(char* type,
             v8::internal::Handle<v8::internal::JSArray> args,
             const v8::internal::MessageLocation* loc) :
       type_(type), args_(args), loc_(loc) { }
   char* type() const { return type_; }
   v8::internal::Handle<v8::internal::JSArray> args() const { return args_; }
   const v8::internal::MessageLocation* loc() const { return loc_; }
  private:
   char* type_;
   v8::internal::Handle<v8::internal::JSArray> const args_;
   const v8::internal::MessageLocation* loc_;
 };
 
 
-namespace v8 { namespace internal {
+namespace v8 {
+namespace internal {
 
 struct Language;
 class SourceInfo;
 
 class MessageLocation {
  public:
   MessageLocation(Handle<Script> script,
                   int start_pos,
                   int end_pos)
       : script_(script),
@@ skipping 30 matching lines @@
 
   static void DefaultMessageReport(const MessageLocation* loc,
                                    Handle<Object> message_obj);
   static Handle<String> GetMessage(Handle<Object> data);
   static SmartPointer<char> GetLocalizedMessage(Handle<Object> data);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_MESSAGES_H_